Does Time Machine use a differential/delta file compression when copying files ?

Hello,
I would like to use Time Machine to backup to a MacBook Air but that computer is using a Virtual Machines store in a single file of 50 GBytes.
Once the initial backup will be done, does Time Machine will only copy the changes in this large file or will everyday copy the full 50 Bytes?
In other word does Time Machine use a differential/dela file compression algorithm (like un rsync)?
If it is not yet the case, can you please file for me an application request to the development team internally?
If others are also interested in such a feature, you’re welcome to vote for it.
Kind regards,
Olivier

Ok, it looks like the current version of Time Machine cannot handle efficiently in network terms large files like Virtual Machine files and this a real issue today.
Is anybody here able to file an official feature request to Apple to be able to use Time Machine efficiently also with large files (let's stay > 5 GBytes) ?
I should propably mean using a differential compression algorythm over the network like the examples below:
http://rsync.samba.org/tech_report/tech_report.html
http://en.wikipedia.org/wiki/Remote_Differential_Compression

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How does time machine use the external disk space??

does time machine back up only the changed or new stuff or does it back up everything? does this mean that if on "day one" it backed up 600 gb worth of data, the next back up on "day 2" would be 600gb+a few more things, or would it be 600gb+600gb+the few more things? Does it back up "day one" in a whole package and "day two" in another package, or does it back up "day one", plus only the different things made from "day one" to "day two""?
similarly, does it keep stuff from the first back up ever, plus anything new or modified in the following back ups, then when it is full, does it let just the oldest files drop off? or does it drop off everything from the initial backup? that is, if I had 20mb of changes would it erase only 20mb of data to make the new data fit, or would it erase all 600gb from say "day one"?
thanks for the answer!
iMac, Mac OS X (10.6.8)
<Email Edited by Host>

See Pondini's TM FAQs for starters.

Does Time Machine back up disk information in addition to all files?

Hi
I want to know if Time Machine back up disk information of my current Apple computer.
These information may include GUID/Apple Partition Map (such as partition names and layout). I check my backups in the Time Capsule, and it seems that only files in the hard drive have been backed up. I kind of know Partition Map doesn't reside in files, but hidden in the hard drive, so I wander if Time Machine does back up them? If so, where are they?
Thank you in advance!

DavidCQ wrote:
Thank you for your information! It seems that Time Machine can only do with Apple OS, and for other OS such as Windows , we need use other tools.
If it's Windows as a guest in a virtual machine, the backing file will get archived. That's certainly a backup, but a woefully inefficient one as it'll drag the whole backing file out each time. Most folks will thus disable that file in Time Machine.
If it's Windows via Boot Camp or Linux in a GPT partition, that'll require using Windows- or Linux-focused tools.
One of the few available OS-agnostic approaches for backing up data is a disk image. Time Machine is not an OS-agnostic backup tool.
As for Windows or Linux or OS X or most any other operating system, each has its own tools and requirements for performing an operating system backup and for recovering and restoring, and it's very rare for any other operating system around really has any clue what those requirements are for a given OS.

Does Time machine clone your system or back up your data files?

I use superduper to clone my mac and its great. I got time capsule this morning and just want to know is it just your user files time machine backs up or does it clone your system?

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Emma Connolly
You can reply to me at [email protected]

Does Time Machine use a lot of CPU power if I leave it on ?

If I leave Time Machine on and have it automatically back up every hour, will that use much of my cpu ?

minimal usage after the initial backup.
Look at your Activity Monitor and see for yourself.
>Applications/Utilities/ActivityMonitor.app>CPU

Time Capsule: "Network name no longer available" error when copying files

Hi!
I've come upon this error when trying to copy files from my PC to Time Capsule:
"Network name no longer available".
This seems to happen only on folders that have image sequences in them (.sgi image sequences).
I was planning on transferring the content of my PCs hard drive to Time-Machine in order to smooth out the migration from my old PC to my new MBP but I have to say that I'm a little less confident about using TC as a storage space for my valuable files.
Is there a work around for this? I have tons of folders with .sgi image sequences and it would be a real shame not to be able to transfer them to Time Capsule.
Please help!

Hi… I don’t think there should be any such limitation for the file transfer wirelessly. However it can be issue, as you wired is connect at a speed of 100 Mbps and wireless connects to the max at 54 Mbps. Try to upgrade the firmware. Also try reducing Fragmentation Threshold and RTS threshold by 40 each under advance wireless settings on the router. Go to www.speedguide.net, and download the TCP optimizer. Try reducing the MTU of your wireless adapter. Please Revert Back, even if this resolves your issue.

When using a Seagate 1T external hard drive and Time Machine to back up hourly, if I delete photo files from the Mac hard drive before the next back up, are these retained on the Seagate drive or will they be lost (overwritten) in the next backu in the ne

Does Time Machine erase previously saved files if, say, photos are deleted from the Macbook upon the next update, or will they be stored indefinately despite the current status of the files stored on the computer? Eg. can I bckup photo files to a Seagate 1T disc and then delete them to make more room on the computer in the knowlwdge that they are always going to be on the Seagate disc? Sorry if this is very elementary but I have not used a back up before like this, and am not sure how successive backups are overlaid or retained. Thanks!!

TM is not designed to do what you ask. As Allan wrote TM is an incremental backup not an archival solution.
If you delete a file from the HD it will eventually be removed from the TM backup (if it ever makes it on to the backup at all).
How long before it is removed depends on a number of factors, TM disk drive size being one factor but not the only one.
Material that is impossible to replace and is important to you (image files usually fitting that description) need to be backed up to as least one other drive and preferably more for long term storage.

I used a partitioned HDD for time machine, using a partition already containing other data files. I am now no longer able to view that partition in Finder. Disk Utility shows it in grey and "not mounted". Any suggestions of how to access the files?

I used a partitioned HDD for time machine, using a partition already containing other data files. I am now no longer able to view that partition in Finder. Disk Utility shows it in grey and "not mounted". Any suggestions of how to access the files? Does using time machine mean that that partition is no longer able to be used as it used to be?
HDD is a Toshiba 1TB, partitioned into two 500GB partitions.
OS X version 10.9.2

Yes, sharing a TM disk is a bad idea, and disks are cheap enough so that you don't need to.
Now
Have you tried to repair the disk yet

Does Time Machine Compare/Verify Files?

I have typically performed manual backups, and have no experience with Time Machine.
Does Time Machine COMPARE / VERIFY that the backup files match the originals?
I used to use Retrospect for Archive/Backup, which logged an alert if there was any mis-match in the backup process. Now I tend to backup files simply using Drag/Drop copying to redundant external storage devices. I have recently encountered errors in this process when backing up larger amounts of data. Hopefully this will not occur using TIme Machine.
What does Time Machine do if there is an error in the backup process?
Is Time Machine the most reliable solution for Archive/Backup?
thanks

Time Machine logs to the system.log as process com.apple.backupd, which you can access via Appplications -> Utilities -> Console
Carbon Copy Cloner logs to a CCC.log which you can access from within CCC, or via Applications -> Utilities -> Console.
CCC will popup and error if there is backup problem.
SuperDuper has its own built-in log, that you access via SuperDuper.
SuperDuper will popup an error if there is a backup problem.
CrashPlan has a /Library/Logs/CrashPlan/ directory with backup logs.
CrashPlan can send you an email if there is a backup problem. Even better, it will tell you if a backup has not completed within the last 3 days. I find that very nice in that automatic backups that stop and you haven't noticed it, is more annoying than not having a backup verification.
I also remember Retrospect. And the verify taking longer than the backup is a good excuse to just make another backup using a different utility and media destination.

Does Time Machine really restore all files of app?

Hi mac people,
I have done a clean install, then i don't want use migration assistant to move back things, but when i move back garageband 6.0.5, i open it, then i realise that only app is been restore but all the loops and audio is not, then i search online found that i have to move those things by my own,
So this problem make me wondering does time machine really fully restore?
I also wondering how about other apps or files do they really all been restore even they SEEN like no problems?
Thanks for helping !!!!!

then i realise that only app is been restore but all the loops and audio is not, then i search online found that i have to move those things by my own,
If you want everything restored from Time Machine, don't use Migration Assistant but use Setup Assistant - migrate al files when you are first prompted to restore from Time Machine or another Mac, after a clean install.
you can select what to restore - the settings, the libraries, the user data.
Since you do not want to use the assistants - to restore Garageband 6.0.5 manually, you transfer all files and folders in the system library:
/Library/Application Support/GarageBand/
and the loops from
/Library/Audio/Apple Loops/
Your plug-ins from
/Library/Audio/Plug-Ins/
and the corresponding folders in your user library ~/Library/

Does Time Machine Ever Delete All Traces of a File?

I have a question. I have read up on Time Machine on various articles, posts, and documents across the web and I am having a hard time understanding exactly how time machine deletes files.
When a disk is full, does Time Machine ever make the decision to delete the last copy or version of a file, therefore completely erasing it off the disk forever? I know that Time Machine deletes older versions of files, but will it ever completely delete the last, final backup of a file to make space? If so, I can't imagine using Time Machine as a true piece of backup software. It seems like it would be useful in restoring your computer in an emergency, but as far as backing up files, it seems that it would be catastrophic, because it may choose to delete the last remaing version of a file to make space and you end up losing that file for ever.
Here is an example:
I create a file X.doc
Time Machine backs it up.
I modify X.doc
Time Machine backs up the copy, keeping both the original and the new copy on the backup drive.
I modify X.doc yet again.
Time Machine drive runs out of space. Time Machine deletes the oldest version of X.doc and backs up the new copy.
I create 10 more files unrelated to X.doc
Will Time Macine remove all remaining versions of X.doc to make space for the 10 new files???
I hope I am making sense.

Derek Doublin1 wrote:
Will Time Macine remove all remaining versions of X.doc to make space for the 10 new files???
The worst TM can do is delete all your older copies of files, not the most recent version.
If the drive is full, then it can't accept any more files period.
If you had a full 100GB boot drive and a 100GB TM drive, the TM drive would be a copy of the boot drive with no room for saved states.
If you changed a file on the full boot drive, then TM updates that file on it's full drive, there will be no copy of the previous version of that file.
TimeMachine makes for a poor pernament backup system, because lets say you do a major files addition to your boot drive, TM backs that up and can go ahead and delete files you realized you accidentially deleted just a few short days ago.
It's better than nothing and works ok for newbies, but more seasoned types use many backup methods in addition to TM, because corruption creep is possible with TM as well as malware as it's hooked up so often, in a lot of cases all the time.
Most commonly used backup methods

Does Time Machine backup system files (/usr/local/*)?

Does Time Machine backup system files (/usr/local/*)?
If so how do you locate them in the Time Machine interface?
If I go into Time Machine mode and type say "/usr/local" in the Time Machine search bar I get nothing although I can open a terminal application and cd to /usr/local and see bin, lib, include, etc.
Of course I can never see /usr/local in Finder either ... only at the command line.
Thanks.

John, another tech pro ("baltwo") suggests:
Run this in the Terminal:
defaults write com.apple.finder AppleShowAllFiles 1
OPTION-click and hold on Finder's Dock icon->Relaunch which reveals all hidden files. Then, look for that file and delete it. To hide all of those, use the same command, substituiting zero for the one, and relaunch the Finder.

Does Time Machine backup open applications/files?

I recently lost my calendars (in Entourage, Ical, Mobileme, etc.), and wanted to restore from a time machine backup.
I tried to restore the Entourage identity from a day or two before only to see that the date in Time Machine for the file was way old.
I suspected that because I leave the app open all the time, particularly all night when my backups run at 11 pm that the file never got backed up. Does this sound right?
Ical, on the other hand (which is synched to mobile me and entourage), even though I rarely open it and use it, seemed to have the updated data.
How does Time Machine deal with files that are in use?

Entourage needs some special handling. I don't use it, so can't tell you exactly how to do it, but if you search this forum for Entourage you should find a post or two (by Kappy and/or Baltwo, I think) with good advice.

I have 2 auxillary disk drives for my MacBokk Pro. Time Machine uses one for backup and I use the other for storage, but I am unable to create a new folder or drag and drop files or folders to the aux drive.

I am unable to create a new folder on either of my auxillary disk drives. I can access the files and folders that were there when I transferred one of the drives from a PC. Time machine uses one for backup and I want to use the other to store photos which are large files. An help would be appreciated.

Thanks for the reply. If I reformat the drive will I be able to access the files on it from the MAC. I do not share the drive with a PC. The files were originally created on a PC which I no longer use. I do want to continue to access the files put there by the PC. I would like to not have to copy them over to the MAC hard drive just to use them. The second aux drive is new and works fine because it was formatted by the MAC. I can drag and drop files there and work with just as if they were on the internal drive.

I have had a series of Macs. They have been backed up with Time Machine. I am trying to restore TM backup files from the older Macs using my new MacBook Pro. No go. What do I do ?

I have had a series of Macs. They have been backed up with Time Machine. I am trying to restore TM backup files from the older Macs using my new MacBook Pro. No go. What do I do ?

I am trying to restore TM backup files from the older Macs using my new MacBook Pro. No go.
Migration Assistant (Finder > Applications > Utilities > Migration Assistant) is the tool that you would use to restore backups from older Macs to another Mac.
Details are here: http://pondini.org/OSX/MigrateLion.html The same info applies for Mavericks and Yosemite. If you are saying that this is a "no go".....where are you getting stuck? What error messages do you see?

Does Time Machine use a differential/delta file compression when copying files ?

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