Time machine backups disappear Yosemite

Since upgrading (that is a joke) from ML to Yosemite I am seeing backups on time machine disappear from my back up drive. Another oddity is that the icon does not spin around while backing up. Any help would be appreciated.

The Time Machine icon stopped spinning when Mavericks was released in the Fall of 2013. Instead, since that time, there is a bit more of a separation in the lower left area of the circle (near the arrowhead) when the backup is occurring. Further, the arrow turns into a double arrow.
Backups may well disappear as the disk housing the Time Machine backups becomes full.
OS X Yosemite: If your Time Machine backup disk runs out of space

Similar Messages

Time Machine backup disappears when iMac sleeps

Tried finding this topic but could not find the specifics. I have an Intel iMac running 10.6.7 and I use a Mercury enclosure with a Seagate Barracuda 2TB SATA for Time Machine backup, connected with FireWire. Every time my Mac goes to sleep overnight, the next morning, the Time Machine icon disappears from the desktop. It's been disconnected, because when I run Check Time Machine, the log reads thusly:
<<Thu Apr 21 10:29:30 com.apple.backupd-auto Not starting scheduled Time Machine backup - time machine destination not resolvable.
Thu Apr 21 12:30:05 [0x0-0x2d22d2].backupd-helper Not starting Time Machine backup after wake - failed to resolve alias to backup volume
>>
Occasionally I'll get the error message on the Mac that a device has been "improperly disconnected" but most of the time when it sleeps the TM drive icon just goes away (even tho the backup drive is still on).
Any ideas? Can I fix this or have to live with it? Are there alternatives to TM that may work better?
Thanks for any help/suggestions.
Best,
Mike

I had the same problem as Bru-Hed, but with a Samsung G3 Station 1 TB with USB-connection. After waking up the MAC the message "improperly disconnected" appeared. Was happy with the solution you gave and changed the power save settings accordingly, the drive holds its power, but....... things did not change. Switching off the MAC and restarting gives no problems with the back-up drive, but after waking up I have to reinstall the back-up drive every time by disconnecting and connecting the USB-connector. After choosing the drive again in Time Machine, everything works properly until the next time the MAC goes asleep......
Any other solution to this problem ?

Time Machine backups disappear

Hi - All my Time Machine backups (3 months worth) have disappeared from my LaCie Quadra Hard Drive after my last Time Machine backup. Either at the end or during the backup, I got an error message saying "Bitmap Mismatch". Any suggestions? Thanks, Bernie

Hamish Morrison wrote:
Well yes in principal I'm sure you're right about the drive capacity but I don't believe its a space, or lack thereof problem. I can't say that there was any unusually large backup that occurred that might cause it to wipe off the older backups.
I have done verification on both source & target drives. No issues found. Same with Techtool.
Yes, I also run Superduper every day to an external drive so at least all is not lost when TM fails. All drives are permanently attached & the Mac runs 24/7.
I also run the TM Buddy widget, but it only records info so far back and the challenge is being aware that you have lost the backup when you don't check it every day. By the time I notice the problem the info that might help diagnose the problem is gone!
I understand but it's really impossible to say now what might have caused it without seeing log info. file system errors are one possible reason but you say all drives check out fine. anything else would be unverifiable speculation at this point. once thing i've noticed in the past that any kind of problems with superduper backups can cause this. so if you ever get any issue with superduper check what's happening with TM.

Can't access Time Machine backups on Yosemite

Hi guys
I'm having some trouble with TIme machine. I did a clean install on my mac. Upgraded it to Yosemite. I could then access my backed up files (although Apple hides most of it for any reason). As soon as I chose the same external hard drive to again be my Time Machine backup drive, all the older backups got unaccessible. When I open Time Machine I can see my older backups but they won't show any files. If I manually look for them in Finder I am locked out.
Is there any way to tell OS X to please let me have my files back?

While in Time Machine, press the key combination shift-command-C. The front window will show all mounted volumes. All snapshots should now be accessible. Select the one you want and navigate to the files you want to restore.
If you need to restore from a backup of the hidden user Library folder, first select a snapshot, then press shift-command-G. A Go to Folder dialog will open. In it, you'll enter the path to the folder. The dialog will help you by automatically completing the parts of the path when you start to type them.
The path begins with slash character ("/"). Enter that. The rest of the parts will be separated by slashes.
The next part is the date and time of the current snapshot. Enter a "2", and the rest of the date should be filled in automatically. Press the right-arrow key to jump to the end of the path. Enter a slash to start the next part.
Next is the name of the volume (usually "Macintosh HD" unless you gave it a different name.) Start to type that, then jump to the end and enter a slash.
The next part is "Users", followed by a slash.
Next is your (short) user name, which is also the name of your home folder.
Finally, enter "Library", then press return. You should now be in the Library folder. From there you can get around as in the Finder.

Migrate time machine backup to Yosemite

I bought a new mac. My old mac was backed to an external disk up using time machine. I connected the external disk to my new machine and powered up. The first thing that launches on first power-up is a special piece of software called migration assistant. The migration assistant re-created my files and everything from the backup external disk. It took a while, but it worked great.
At the end of the migration assistant run, it asked me whether I wanted to use the external disk for future backups. Migration assistant warned that if so then it would have to alter the backup files (probably some indexes is my guess) in a way that the backup could no longer be used with my old computer. Well, I was a little concerned about losing things before I tried my new computer, so I told migration assistant to leave the time machine backups alone.
Now I am happy with my new machine, and I want to migrate the old backup files to become the backup set for the new machine. How do I do that?
If I enter migration assistant (it is in the applications folder) it appears to behave as though it will re-init my new computer. I do not want to do that. I only want migration assistant to convert the save set on my external disk into a save set for time machine under Yosemite.
Thanks for your help.

There is a way to force the backup history to be inherited, but I consider it too complicated for most users to carry out, and it won't do any good if you've already started using Time Machine with the new setup. If you're familiar with the shell and want to try it, search the tmutil(8) manual page for the terms "inheritbackup" and "associatedisk."
Otherwise I suggest you set the backup drive aside and stop using it until you're sure you'll no longer need the data. Then erase it and start over. Meanwhile, start a new backup on another drive. You need more than one backup to be safe anyway.

Still cannot access time machine backups after Yosemite install

Can anyone tell me what to do to be able to access my time machine backups. When I enter time machine nothing except apps and desktop are accessable. Thus I cannot restore anything that was "backed up" even this morning, much less any other day this year. Yosemite was installed on Oct. 19, took 2 days to download to an 2013 iMac. The first time machine backup took over 24 hours. I have made 1 backup per day since, only problem is that I cannot access any of this data. Please help me.

A bit more information would help figure out the problem. Maybe a screen shot of what you're seeing or not seeing (use Command+shift+4 to save an area of the screen or a window -type space first to capture an entire window- to a file and then attach that file to your posting reply). You might look at the Console app to get more information about what actually happened during your backups - suggest putting "backupd" (without the quotes) in the search field at the top right of window in Console - with the "All Messages" query selected on the left part of the window). Console is located in the /Applications/Utilities folder. After you enter the backupd in the search field only those messages that contain that string will appear which helps a lot since so many messages are normally shown without any search field string.
Depending on how long ago the backups happened, you might need to select previous versions of the system log files - they get archived and compressed to files like system.log.0.bz2 or system.log.1.bz2 (these are in the /var/log query choice if you don't see them in the existing query choices - just click on the triangle to the left of the "/Var/log" entry if needed). Console knows how to show the messages that are in these compressed files, so you don't need to do anything other than click on the query name.
Also if you look in TimeMachine in System Preferences are there any exclusions (click on the Options button in TM System Preferences to show what the existing exclusions are)? A screen shot of those would be helpful also.
Is there only one drive with the single Mac OS partition on it?
Hope this helps a bit...

Time Machine Backups Disappearing

I am running an iMac 2.7 GHz with 12 GB memory and 2 TB Hard drive. I have a very large iPhoto library which has become corrupted. I entered Time Machine and grabbed the last backup and moved it forward. At that time, I could see backups extending into the past as usual. The file took 14 hours to be moved to the present and it had the same corruption problem, so I threw it away and returned to Time Machine to go further into the past - to my surprise all backups after late yesterday are grayed out / not accessable (no dates next to the timeline on right) - it looks like I just set up Time Machine yesterday instead of months ago. Since I never trust anything completely I did a manual backup a few weeks ago but I have done a lot of work on the library since then. Any way to re-gain access to those grayed out backups? BTW the Time Capsule disk is no where near full; not sure how this would have happened. Any help appreciated.

Hi:
I have never seen anything like that happen, but I am no "expert."
It occurred to me that you might try running repair disk on your external drive. Candidly, I do not know whether that will help either, but it might be worth a try.
You might also look at these articles about Time Machine problems to see if any fit your circumstance:
https://discussions.apple.com/search.jspa?resultTypes=&dateRange=all&peopleEnabl ed=true&q=time+machine+backup+grayed+out&containerType=&container=&containerName =&username=&rankBy=relevance&numResults=15
Barry

Time Machine backups disappeared. HELP!!!

Last night I ran a Time Machine backup of my MacBook Pro just like I do every night, and it completed successfully. This morning I noticed a msg saying my backup failed because there wasn't enough room on the disk (I leave my Time Machine disk plugged in all of the time when I'm home). When I enter Time Machine it doesn't show any of the old backups--it looks like it's never used the disk. When I browse the disk in Finder I see a backups folder. I really need to have access to my backups! I've tried restarting the computer, and control clicking Time Machine and selecting "Browse other Time Machine Disks" and nothing seems to help.
The OS is 10.5.8
I will greatly appreciate any assistance anyone can provide!

Open Disk Utility & highlight the external drive, see if it needs Repair.
Have you looked through Pondini's extensive TM help site?
http://Pondini.org/TM/FAQ.html

Time Machine backup disappeared--devastating loss

Long story short, my system drive became corrupted and I wasn't able to repair it with Disk Utility or DiskWarrior. I knew my Time Machine backup was up to date on my Time Capsule, so I formatted (quick format) my drive and installed OS X again, thinking I could just reimport my info back from the Time Machine backup.
What happened is now the hard drive is not showing up in the sparsebundle file. The other 2 internal drives seem to be fine.
In retrospect, I know I screwed up process. But my question is, is there ANY way to make that backup available again? I know it all must still be there but somehow the link to it must have been broken and I can't access it.
I lost everything but the videos/photos of my 17 month old son is devastation. I really hope someone can save me here.
(I did use a recovery app (read only) on the system drive so I do have access to the raw data, but there are literally millions of files to sort through, many corrupted).

Frozo wrote:
Disk Utility returned "The volume Time Machine Backups appears to be OK."
That was quick!
Would you know what the preference file would be that holds the information as to which drives are being backed up? I may be able to do a content search for it on my recovered raw data files. Id be curious--maybe I had accidentally added the disk on the exclude list somehow!? Maybe I wasnt 100% sure, because I havent had to access it for over a year at least.
/Library/Preferences/com.apple.TimeMachine.plist
(That's the top-level Library folder, not the one in your user home folder). It contains the current instructions; if you make a change, that will be reflected in subsequent backups, but earlier ones won't be changed.
But of course, if you don't have the backups, you can't tell what was in that file.
Lets say it was recently deleted somehow, is there any recourse to pulling anything off it?
Even if it was recently added to the exclusion list (all internals are backed-up by default), that wouldn't affect prior backups. Those would still be in the Backups.backupdb folder, until the entire backup (or all backups of a selected item, as below) was deleted. Since you have at least a year's worth of backups, it would still have been there.
If you really want to double-check, Time Machine puts a hidden, somewhat cryptic, log in each backup folder. Among other things, it shows which volumes were backed-up.
First, you have to change the Finder to show hidden items. See #A3 in Time Machine - Troubleshooting if you don't know how to do that.
Then via the Finder, locate the log file, shown in gray since we mere mortals are not authorized to read it, either:
Then you must give yourself read rights to the file. Right-click it and select Get Info. In the window that shows, open the Sharing & Permissions section at the bottom. Click the padlock and enter your Admin password, then click the plus sign and select your user account. That will give you read rights.
Open it with a text editor. Here's part of a sample, showing the "preflight" to back up two drives:
See if the "missing" drive shows up there. If not, it wasn't backed-up.
But then, even it it were physically delted, it wouldnt have been an accident, since it would have to be manually removed from each incremental folder and there are about 70 of them!
There is a "Delete all backups of ..." option in the TM browser that would do them all at once. It's almost impossible to do it by accident, though. See Time Machine - Frequently Asked Question #12.

Mavericks Time Machine Backup in Yosemite?

They say there are two kinds of people in the world. Those who backup and those who wish they did. I am the backup person, but when I did a clean install of Yosemite on my HD for a number of reasons, I cannot find my iphoto files (1000s of pictures). And I can't seem to utilize Time Machine at all. I have been able to manually drag files (music, documents, etc.) from the backup folder on the disk to the new system. But nowhere are my iphoto pictures....
So, where do I get the iPhoto files so I don't lose all my pictures? Is there a way to access a Mavericks Time Machine in Yosemite? Any help would be appreciated.
rog

While in Time Machine, press the key combination shift-command-C. The front window will show all mounted volumes. All snapshots should now be accessible. Select the one you want and navigate to the files you want to restore.
If you need to restore from a backup of the hidden user Library folder, first select a snapshot, then press shift-command-G. A Go to Folder dialog will open. In it, you'll enter the path to the folder. The dialog will help you by automatically completing the parts of the path when you start to type them.
The path begins with slash character ("/"). Enter that. The rest of the parts will be separated by slashes.
The next part is the date and time of the current snapshot. Enter a "2", and the rest of the date should be filled in automatically. Press the right-arrow key to jump to the end of the path. Enter a slash to start the next part.
Next is the name of the volume (usually "Macintosh HD" unless you gave it a different name.) Start to type that, then jump to the end and enter a slash.
The next part is "Users", followed by a slash.
Next is your (short) user name, which is also the name of your home folder.
Finally, enter "Library", then press return. You should now be in the Library folder. From there you can get around as in the Finder.

Networked Time Machine Backup in Yosemite (10.10.1)

Hello Everyone!
I am having issue using a networked Time Machine volume with my Debian Box. Prior to 10.10.1 Yosemite update Time Machine was working just fine. Even issuing the command sudo tmutil setdestination "afp://<Remote Server Address>/Time\ Machine/<sparsebundle>" and defaults write com.apple.systempreferences TMShowUnsupportedNetworkVolumes 1, Nothing seems to work. Time Machine doesn't recognize the drive. I am able to connect to the drive by going to Go, but Time Machine still doesn't see the drive. My Debian Box is using Nettalk in conjunction with AFP. I followed this link as a guide. If anyone know a work around that would be greaaaaat.
Thanks!

A "Netatalk" server is unsuitable for use with Time Machine, especially if it's your only backup. I know this isn't the answer you want. I know Time Machine accepts the server as a backup destination. I know that the developer says the server will work with Time Machine, and I also know that it usually seems to work. Except when you try to restore, and find that you can't.
Apple has published a specification for network devices that work with Time Machine. The incomplete, obsolete Netatalk implementation of Apple Filing Protocol doesn't meet that specification.
If you want network backup, use as the destination either an Apple Time Capsule or an external storage device connected to another Mac or to an 802.11ac AirPort base station. Only the 802.11ac base stations support Time Machine, not any older model.
Otherwise, don't use Time Machine at all. There are other ways to back up, though none of them is anywhere near as efficient or as well integrated with OS X. I don't have a specific recommendation.

Time machine backup disappeared after upgrading OS from Lion to Mountain Lion.

I made a full backup of my 2011 Macbook Pro to my network drive through Time Machine in order to upgrade to Mountain Lion. However, after the upgrade, the backup could not be found. As it went through the install, I opted to recover the backup afterwards as I have read that you can do that after the upgrade. But the migration assistant could not find a backup.
So I looked in Finder at my external drive, and sure enough the backup is gone.
Some extra info:
So I don't know if this has affected anything important, I'm not that computer smart.
Prior to this I've been trying to get Windows 7 to work on bootcamp (still not working). I needed the OS X install disc, but I didn't have the install disc(I had OS Lion installed) and I bought the laptop from someone at work, so I couldn't get the Lion iso pulled from the recovery to a flash drive (it required the previous owners password to his apple account). Therefore I purchased the Mountain Lion Upgrade (Lion being no longer available. I didn't really want mountain lion). So when I started the Mountain Lion install, I had the "brilliant" idea to install it on the flash drive I had intended to use in the first place. Well, I didn't think it was gonna start the upgrade immediately after that. Anyways, after I realised my mistake I redid the install, process was the same, chose the main HD, went well. This was where I opted out of the recover-from-backup option. At this point I tried to restore my backup through the migration assistant. It said there was not enough room on the hard drive. I then noticed that all the memory used up prior upgrading was still in use, but under the old main user. I didn't do much with it, and thinking that my backup had my back, I did a full clean install. Another mistake. After the clean install, the migration assistant said there was no backup. I looked in finder, it was gone.
I didn't touch the hard drive thinking it is either hidden, or deleted but not written over yet and still could be recovered. I don't know how to explore these options, I can't find anything online about either. Or perhaps there are other options to consider?
Please advise.

It's early 2011.
I have been able to purchase the upgrade under my username at the upgrade price. I didn't know that Lion stays under the previous owner's Apple account. I mean I got that when I tried putting the Lion Iso on a bootable drive (for the purpose of bootcamp) it said I needed the username and password of the Lion purchaser, but I went to get my own license then, but it was Mountain Lion at the upgrade price. I didn't think it had anything to do with my backup.
So looking back, that seems like a warning Apple should have put out for people to be wary of. "Hey, don't buy a laptop from someone and then upgrade, you'll lose everything." That's a load of crap. I thought I had no worries as long as I had a backup. I've never needed a backup, then the one time I thought I was in good hands. Nope, I try to do something, and it takes everything from me. That was a lot of data worth of stuff. 550 Gigs! I was shocked and in complete disbelief the moment I realized what I had done.
I just don't want to give this up.

Time Machine backups disappeared... in a way.

I've been having problems with my iMac for months now. I'm feeling like I'm on Microsoft PC again... not even joking.
I had to bring it to the Genius bar 4 times, first time my HDD was failing, was replaced (no more AppleCare so, shucks), but it started behaving even worst after that... they changed it AGAIN, I changed and upgraded the RAM to no avail, they did diagnostics, all was in fine condition... so their only idea was corrupted files or prefs.
So I reinstalled OS 10.8 clean and imported everything but the prefs (to start) and it seemed to do the trick... for about a month. And it went bad again.
Main problem was Finder : wouldn't see anything plugged in USB (or would stop seeing it after a few seconds/min), would get sluggish, I wouldn't be able to shut it off...
I got the SBBOD regularly, in any app...
And MAINLY... if I restarted or shut off and re-started, I would get stuck on the grey login screen... with no actual login screen (just the grey fabric-like background). Or, sometimes, just the white screen after the "dong", spinning gear, or not, apple icon, or not.
All in all... bad.
So... I re-installed OS 10.8 from scratch, AGAIN. But didn't import anything.
I had a fresh backup in Time machine AND I used Carbon Copy Cloner to get a full copy of my HD (not a startup disk, just the files). I also copied my documents on my macbook, just to be on the safe side.
(side note: to those intereste, is the iMac running well now? Seems so. But last time it did too, for almost a month... so I can't trust it at all, I don't dare start to use it as my main computer again, I don't know what to re-install and how long to run it before installing the next app to be sure I could put my finger on what the **** problem was, if indeed it WAS coming from my side and not something in the hardware!)
Main bug...
As I said, before I pulled the plug and did the clean install, I made sure I had a full, fresh backup on TM.
Now, if I plug in my backup HDD and look inside, I see, indeed, that the latest backup is from a few days ago. And if I open it, everything seems to be there (as far as I can tell. I'm far from being a newbie but I couldn't know if all the hidden files are there for all apps)
BUT... if I open, say, the Finder or Mail app and go in Time Machine to bring back "lost" files... it says my last backup (or last available files) are from 3 MONTHS AGO! Which is when my HDD first failed.
What the heck?!
Now... I'm happy to see the backups are in fact, there. But how do I access those files?
Why don't they show up?
Does it mean that nothing in Mail was backed up? Why wouldn't it be? (No, it wasn't selected as "exclude from backup")
Plus... all my documents are there in the latest backup... so, shouldn't they show up when I try to see them in Finder/TM?
Thanks!

Hey...
I'm not sure I get what you mean... do you mean if you move your mouse around on the grey "fabric" screen you eventually can "guess" where to enter your login and it eventually works?
In my case I also can move the mouse around, but I never got it to change to anything other than the arrow, and the Genius couldn't get it to do anything either... the only solution is to shut the computer off manually, unplug it from the wall, wait 10 sec, replug it, wait another 10 sec and try again...
(they tried all the possible options of starting with CTRL-this and shift-CTRL-that and nothing had worked)
Now we're getting off topic, but I'm happy to see I'm not alone!
And right now I'm almost happy because my iMac seems to be getting buggy again! Yup, almost happy because it's better than not knowing... and because it proves that it wasn't my data, HA! I knew it didn't make sense!
I tried to change preferences in Finder (show hard drives and start with Home folder screen) and it wouldn't take effect... I also got the SBBOD... so I tried to restart my computer... and now it wouldn't because iPhoto is unresponsive (I was using it with my externa HDD, but just so you know, last time things bugged it had not been used at all)...
AND... I also got the error message that "this disk has not been ejected properly"... while all my external HDDs have not been touched and my energy settings are set to NEVER go to sleep (except the screen). That had been a symptom before too. And killed an HDD or 2.
Isn't this fun.
Anyone knows how long the AppleCare repair lasts for? Is it for 90 days after the last time they had it, or since they first did ANY repair? 'cause I only have a few weeks left if it's the latter...

Initial time machine backup crashes Yosemite 10.10.3

I have a 15" Macbook Pro 2.3 GHz Intel Core i7 running Yosemite 10.10.3 (14D136). I previously had a 1TB Time Capsule that ran pretty much without a problem. I recently upgraded to a new 3TB time capsule (http://store.apple.com/us/product/ME182LL/A/airport-time-capsule-3tb) .
I have attempted numerous times to complete the initial backup both via wifi and hardwired into the thunderbolt port. It will run for an hour or so then just says (stopping). After that the computer gives me the pinwheel of death. After a restart everything runs fine and can restart process but same things happens. I have about 720GB to transfer so it takes a while (10 hrs or so). Every time I return it has stopped. I have erased and reinitialized the time capsule disk several times.

These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
Step 1
For this step, the title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
In the top right corner of the Console window, there's a search box labeled Filter. Initially the words "String Matching" are shown in that box. Enter "BOOT_TIME" (without the quotes.)
Each message in the log begins with the date and time when it was entered. Select the BOOT_TIME log message that corresponds to the last boot time when you had the problem. Now clear the search box to reveal all messages. Select the ones logged before the boot, during the time something abnormal was happening. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
For example, if the system was unresponsive or was failing to shut down for three minutes before you forced a restart, post the messages timestamped within three minutes before the boot time, not after. Please include the BOOT_TIME message at the end of the log extract—not at the beginning.
If there are long runs of repeated messages, please post only one example of each. Don’t post many repetitions of the same message.
When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Some private information, such as your name, may appear in the log. Anonymize before posting.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Step 2
In the Console window, select
          DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports
(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar.
There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down. You'll see a list of reports. A crash report has a name that begins with the name of the crashed process and ends in ".crash". A panic report has a name that begins with "Kernel" and ends in ".panic". A shutdown stall report has a name that ends in ".shutdownstall". Select the most recent of each, if any. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot. It's possible that none of these reports exists.
I know the report is long, maybe several hundred lines. Please post all of it anyway.
If you don't see any reports listed, but you know there was a crash or panic, you may have chosen Diagnostic and Usage Messages from the log list. Choose DIAGNOSTIC AND USAGE INFORMATION instead.
In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.)
Please don’t post other kinds of diagnostic report—they're very long and rarely helpful.
When you post the log extract or the crash report, you might see an error message on the web page: "You have included content in your post that is not permitted," or "The message contains invalid characters." That's a bug in the forum software. Please post the text on Pastebin, then post a link here to the page you created.

Second Time Machine backup wiped after Yosemite install

Following on from my initial thread a few weeks ago (https://discussions.apple.com/activity?streamSource=connections&streamID=1989606) regarding the disappearance of my Time Machine backups from my iMac after installing Yosemite (7 people reporting a similar experience) and having noticed that the data seems to be 'hidden' on the backup drive, my partner upgraded her macbookpro and wow... lo and behold, the exact same damned 'glitch'.
Having not connected the external to the laptop for a few weeks after upgrading (yeah, yeah, I know) the reminder said something like "Time Machine has not completed a backup since 5th January" so we attached the external only to be given the error that the external didn't have enough room to backup the data and that the last successful backup was sometime in September 2014.
LogViewer for Time Machine states:
5:35:09 pm - Starting manual backup
5:35:09 pm - Backing up to /dev/disk2s2: /Volumes/Extreme Brain for Backup/Backups.backupdb
5:35:10 pm - Event store UUIDs don't match for volume: HD
5:35:10 pm - Deep event scan at path:/ reason:must scan subdirs|new event db|
5:35:10 pm - Running event scan
5:38:12 pm - Finished scan
5:38:14 pm - Saved event cache at /Volumes/Extreme Brain for Backup/Backups.backupdb/Melanie’s MacBook Pro/2015-02-01-173510.inProgress/217DA034-93A7-423F-9E1B-AFD794855456/.087C6F9B -067A-3B9C-B8C3-EA26A092B101.eventdb
5:38:14 pm - Not using file event preflight for HD
5:41:23 pm - Found 527595 files (98.94 GB) needing backup
5:41:23 pm - 118.74 GB required (including padding), 12.28 GB available
5:41:23 pm - No expired backups exist - deleting oldest backups to make room
5:42:47 pm - Deleted backup /Volumes/Extreme Brain for Backup/Backups.backupdb/Melanie’s MacBook Pro/2014-08-17-151644 containing 6.42 GB; 18.72 GB now available, 118.74 GB required
5:42:47 pm - Removed 1 expired backups so far, more space is needed - deleting oldest backups to make room
5:42:47 pm - Deleted 1 backups containing 6.42 GB total; 18.72 GB now available, 118.74 GB required
5:42:47 pm - Backup date range was shortened: oldest backup is now Feb 1, 2015
5:42:47 pm - Backup failed with error 7: Not enough available disk space on the target volume.
6:32:00 pm - Starting automatic backup
6:32:00 pm - Backing up to /dev/disk2s2: /Volumes/Extreme Brain for Backup/Backups.backupdb
6:32:01 pm - Forcing deep traversal on source: "HD" (device: /dev/disk1 mount: '/' fsUUID: 087C6F9B-067A-3B9C-B8C3-EA26A092B101 eventDBUUID: 83559EC0-09D1-410C-BDEF-BBF54FE7A56C)
6:33:30 pm - Total content size: 198.52 GB excluded items size: 77.96 GB for volume HD
6:33:30 pm - Found 617219 files (120.56 GB) needing backup
6:33:30 pm - 142.04 GB required (including padding), 18.72 GB available
6:33:30 pm - No expired backups exist - deleting oldest backups to make room
6:33:31 pm - Backup failed with error 7: Not enough available disk space on the target volume.
6:32:00 pm - Starting automatic backup
6:32:00 pm - Backing up to /dev/disk2s2: /Volumes/Extreme Brain for Backup/Backups.backupdb
6:32:01 pm - Forcing deep traversal on source: "HD" (device: /dev/disk1 mount: '/' fsUUID: 087C6F9B-067A-3B9C-B8C3-EA26A092B101 eventDBUUID: 83559EC0-09D1-410C-BDEF-BBF54FE7A56C)
6:33:30 pm - Total content size: 198.52 GB excluded items size: 77.96 GB for volume HD
6:33:30 pm - Found 617219 files (120.56 GB) needing backup
6:33:30 pm - 142.04 GB required (including padding), 18.72 GB available
6:33:30 pm - No expired backups exist - deleting oldest backups to make room
6:33:31 pm - Backup failed with error 7: Not enough available disk space on the target volume.
This is disappointing. Like seriously (insert swearword here) disappointing. No one has any idea what the glitch might be? Two different machines experience the exact same issue with Time Machine after upgrading is more than a coincidence in all my years of Apple fanboy-ism.
I am annoyed. Just letting folks know that

Not exactly the same error message, but start with C4 in the 1st linked article.
Time Machine Troubleshooting
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