Time Machine does not run automatic backups

For the last couple of days TM is refusing to run the hourly backups.
Manual backups run fine, but not the automatic ones.
Modifying the exclude list seems to have no effect on the manual backups.
It keeps using the "old" exclude list, i.e. the one I had before the problem
started.
In /var/log/system.log I find the following message every hour:
Nov 18 21:26:03 macdelta com.apple.backupd-auto[12774]: Not starting scheduled T
ime Machine backup - time machine destination not resolvable.
I checked the plist
/System/Library/LaunchDaemons/com.apple.backupd-auto.plist
and it seems to be fine. It is identical to the one in another mac that shows no problems with TM. The same is true for the other plists related to backupd in that directory.
Question 1: What are all the plists that control the behaviour of TM
Question 2: How do I resume hourly automatic backups?

My laptop's drive is encrypted and my laptop is with me at all times. The backup disk remains at my desk and does not have a cable lock. The important thing to consider here is that even if your laptop drive is encrypted (e.g., through FileVault), the TimeMachine backups *are not* (unless you are logged out of your account when you backup--at which point, why bother using TimeMachine over a simple disk cloner such as SuperDuper!?).
Anyway, that's off-topic for now. You mention that it changed the element of the plist that identifies the backup volume, do you mean the UUID element? I noticed it changed:
10.6.4:
<key>DestinationVolumeUUID</key>
<string>040F3E3C-11BF-3AF9-8813-2B6110B200A0</string>
10.6.5:
<key>DestinationUUID</key>
<string>24E15602-063A-3930-B1FE-F2DB15865083</string>
In addition, after doing a reset (while attempting to trouble shoot this issue), the new plist is missing some things the old plist had--for example:
<key>HostUUIDs</key>
<array>
<string>00000000-0000-1000-8000-0017F2C65E0C</string>
<string>25233988-B93F-56AF-B940-F386CB4442EC</string>
</array>
Thoughts?
-Chuck

Similar Messages

Time Machine does not make automatic backups to TC

I had my MB Air make the first backup via TM to my TC overnight.
I worked OK, and made extra backups every hour.
When my MBA now connects to the TC, it does not backup automatically every hour.
I have to do this via "Back Up now".
In the TM preferences, it mentions "Next backup: when Mac is plugged in".
Anyone knows what the problem is??
Thanks.

You need to have the power supply plugged in to do the hourly backups. It's a failsafe so that the laptop doesn't run out of battery when backing up. And before you get into it, no it's not the same as being wired to do a backup, because you can be plugged in to an outlet anywhere in the house and still be backing up to the Time Capsule.

Time machine does not appear to backup an external HD. how do I get that included in the backup?

time machine does not appear to backup an external HD. how do I get that included in the backup?

In the Finder, press the key combination shift-command-C, or select
Go ▹ Computer
from the menu bar. A window will open showing all mounted volumes. Select the one in question and open the Info window. What is shown as the Format in the General section? If it's not "Mac OS Extended," Time Machine can't back up the volume.

Time Machine does not see original backup file on Time Capsuel after reset.

I recently moved. I have a Time Capsule which is also my airport base station. I have about 7 months worth of back-ups on the drive for an iMac and a MacBook. The local cable company would only hook up the modem directly to my iMac and would not set up through the Time Capsule as it is not one of their routers. No problem. I did it once -- I could do it again. After discovering that it was not as simple as plugging the ethernet cable into the Time Capsule (after doing so, the Time Capsule recognized it had internet feed -- the iMac recognized the Time Capsule/Airport network -- but I could not get onto the net.) I discovered that I needed to do a hard reset. The instructions said the files would not be erased. They were not. I can still see the original back-ups for both computers in finder. But Time Machine does not recognize that either computer was ever backed up. There is no history and when I try a back-up it begins from scratch and creates a brand new back-up file.
How do I get Time Machine to recognize the original back-up files? I tried "choosing disk" in Time Machine preferences but it only lets me choose the actual disk (the Time Capsule) and not an individual back-up file
Thanks in advance to the collective brain trust.
Robert

I saw a post on another discussion about this subject, and one user found this workaround:
2) Start the backup via wireless connection. Stop the backup. Unplug external HD and plug in via USB or FW (you want FW800). Time Machine appears smart enough to continue your backup in a manner that is useable by the AEBS.
This only makes sense for the first backup (or if you have a lot of data for one particular incremental backup), as it removes the whole convenience factor of wireless.
The post got this reply:
Thx for your #2 tip on using Time Machine with an Airport Extreme Base Station, then switching to a wired connection. Worked perfectly.
Started the TimeMachine b/up wirelessly, allowed it to run for a couple minutes, then stopped it, unplugged the USB drive from the AEBS, plugged it into the computer directly via FW400, opened TimeMachine and it recognized the Disk. Ran TimeMachine via the wired connection, after it finished I ejected it, plugged it back into the AEBS, initiated the AirDisk in the finder, then opened TimeMachine and presto!!
Awesome tip. Note: this works for first-time TimeMachine wireless backups only. Saved me over 40 hours of wireless waiting!!
http://gizmodo.com/370017/how+to-use-time-machine-with-an-airport-extreme
Can anyone confirm that this will work?

Time machine does not notify re backups

Time machine used to send notifications"10 days no back-up"
It no longer happens since Yosemite installed.Can this be adjusted? Thanks

Its also saving "missed" backups to your hard-drive for later transfer to time machine - so the backup is still occurring - just not to the time machine disk (same for Icloud backups).
As it is baking up the engineers may have decided you do not need a message -- you may want to give feedback to apple (this is not the place - go to apple support - that you till would like the message because .......
If you are using a laptop - consider getting a docking port (if available) for home use - that way you can have all hardware hooked up to the docking port so the time machine drive should load up and backups continue while at home. (docking ports make it easy to hook up printers, drives, full keyboards and an extra monitor to a lap top and keeps the laptop off the desktop so it can get some air).

Time Machine does not display older backups.

Running 10.6.4 with Time Machine saving to a Time Capsule, for the past year.
Opening Time Machine displays the bars for older backups but does not display dates/times against them and I cannot move backwards or forward to select an option to restore. However, it does mount the Time Machine backup disk image on the desktop and I can browse this and restore a file using Finder. So, I know that I have my years-worth of backups on the Time Capsule, but how can I get Time Machine to display them -- I'm guessing it needs a re-instal of Time Machine?
cheers
Birdflier

Hi Pondini,
I got it fixed today, thank you everyone for your help. The thing that ended up fixing it was deleting the hidden files ".com.apple.timemachine.supported" and ".002332b4a7fc" on the root directory of the time machine disk. Now my months worth of backups are viewable again!
I didn't find this on your website (maybe I didn't look hard enough). If it's not there, perhaps it would be a good thing to add to your site? Hopefully it will save a few people some frustration! Thanks for making the site - it looks like a great resource.
--Hayden

Time Machine does not erase old backups

Hi,
I have a problem using Time Machine on my MacBook Air. I use a LaCie 500GB Rugged All-Terrain Hard Drive for backup. The external drive has 3 partitions, one of which is dedicated to time machine and measures 128 Gb. It happens very often that I receive an error message saying that Time Machine cannot complete backup as there is not enough space and that I should manually remove old backups. Time Machine is supposed to do that automatically. The backup partition is of the same size as the internal flash drive which is not even full so I don't see why there should be a problem.
I also have a MacMini with an external Iomega drive and same setup (3 partitions on the external drive and the Time Machine dedicated one of the same size as the internal drive) and I never had an issue with the Time Machine not erasing old backups to make room for the new ones.
How can I fix the problem on the MacBook Air?
Many thanks in advance,
Igor

How much space is currently in use on the volume TM is backing up from? If it needs to do a large backup for some reason, there may not be space to do so without deleting so much that you are left with less than a full backup. TM needs the backup drive to be a minimum of 2-3 times larger than what is being backed up.

Time Machine does not see older backups on Time Capsule

I use a wifi network to connect to the internet as well as a USB modem. The result is that my Time Capsule is not always connected.
I set up my Time Capsule (using the wifi network) and ran what I believe was a successful backup.
Now Im trying to run another backup and I have my iMac connected using the wifi network.
When I open Time Machine it show an icon on my desktop saying "Time Machine Backups" Inside this is lots of folders that appears to be some form of backup.
If I then click on "Select Disk" it give me the Time Capsule as a option to select. Once this is done it says 1.76TB of 2TB available.
Below that it says Oldest backup: None AND Latest Backup: None. Below that is the white and blue backing up bar that has been running for some time with "preparing backup..."
I have the Time Capsule connected to the iMac with a LAN cable...thinking that this will speed up the process?

vlakvarkie wrote:
Below that it says Oldest backup: None AND Latest Backup: None.
Once you're disconnected from the backups, those fields won't be shown until the next backup completes successfully. (Prior to Lion, it showed a couple of dashes -- instead of None. We've asked for either the dashes back or something like "unknown" or "not available," but so far they haven't changed it.)
Below that is the white and blue backing up bar that has been running for some time with "preparing backup..."
That can take quite a while, especially if it's been a while since the last one. See #D1 in Time Machine - Troubleshooting.
I have the Time Capsule connected to the iMac with a LAN cable...thinking that this will speed up the process?
Yes, by all means. It should be 2-3 times faster, and much more reliable, than WIFI.

Time machine does not show latest backups

My Time Machine backup to an external NAS (WD Mybook World Edition) runs without any error on the GUI, but when I look into the Time Machine finder history I can only see backups which are 13 days old (June 1st).
here is the log of the successful (?) run:
13.06.12 07:49:17,673 com.apple.backupd: Starting standard backup
13.06.12 07:49:37,736 com.apple.backupd: Attempting to mount network destination URL: afp://[email protected]/WD_Backup
13.06.12 07:50:09,976 com.apple.backupd: Mounted network destination at mountpoint: /Volumes/WD_Backup using URL: afp://[email protected]/WD_Backup
13.06.12 07:50:31,443 com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN
13.06.12 07:50:35,076 com.apple.backupd: Disk image /Volumes/WD_Backup/silverstar.sparsebundle mounted at: /Volumes/Time Machine-Backups
13.06.12 07:50:35,091 com.apple.backupd: Backing up to: /Volumes/Time Machine-Backups/Backups.backupdb
13.06.12 07:50:42,703 com.apple.backupd: Deep event scan at path:/Users/florian/Pictures/Aperture Trial Library.aplibrary/Database/apdb reason:must scan subdirs|missed reservation|
13.06.12 07:50:43,331 com.apple.backupd: Finished scan
13.06.12 07:51:11,996 com.apple.backupd: 1.33 GB required (including padding), 763.52 GB available
13.06.12 07:51:11,998 com.apple.backupd: Waiting for index to be ready (101)
13.06.12 07:56:03,871 com.apple.backupd: Copied 1766 files (739.0 MB) from volume Macintosh HD.
13.06.12 07:56:15,835 com.apple.backupd: 1.34 GB required (including padding), 763.52 GB available
13.06.12 07:58:16,546 com.apple.backupd: Copied 1323 files (313.4 MB) from volume Macintosh HD.
13.06.12 07:58:45,338 com.apple.backupd: Starting post-backup thinning
13.06.12 07:58:45,338 com.apple.backupd: No post-back up thinning needed: no expired backups exist
13.06.12 07:58:45,592 com.apple.backupd: Backup completed successfully.
13.06.12 07:58:49,102 com.apple.backupd: Ejected Time Machine disk image.
13.06.12 07:58:49,661 com.apple.backupd: Ejected Time Machine network volume.
13.06.12 07:59:41,572 com.apple.backupd: Attempting to mount network destination URL: afp://[email protected]/WD_Backup
13.06.12 08:00:09,835 com.apple.backupd: Mounted network destination at mountpoint: /Volumes/WD_Backup using URL: afp://[email protected]/WD_Backup
13.06.12 08:00:30,871 com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN
13.06.12 08:00:33,932 com.apple.backupd: Disk image /Volumes/WD_Backup/silverstar.sparsebundle mounted at: /Volumes/Time Machine-Backups
Configuration:
Mac OS X 10.7.4
WD MyBook World Edition 2TB 01.02.12 with MioNet
Any idea what's wrong?

My Time Machine backup to an external NAS (WD Mybook World Edition) runs without any error on the GUI, but when I look into the Time Machine finder history I can only see backups which are 13 days old (June 1st).
here is the log of the successful (?) run:
13.06.12 07:49:17,673 com.apple.backupd: Starting standard backup
13.06.12 07:49:37,736 com.apple.backupd: Attempting to mount network destination URL: afp://[email protected]/WD_Backup
13.06.12 07:50:09,976 com.apple.backupd: Mounted network destination at mountpoint: /Volumes/WD_Backup using URL: afp://[email protected]/WD_Backup
13.06.12 07:50:31,443 com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN
13.06.12 07:50:35,076 com.apple.backupd: Disk image /Volumes/WD_Backup/silverstar.sparsebundle mounted at: /Volumes/Time Machine-Backups
13.06.12 07:50:35,091 com.apple.backupd: Backing up to: /Volumes/Time Machine-Backups/Backups.backupdb
13.06.12 07:50:42,703 com.apple.backupd: Deep event scan at path:/Users/florian/Pictures/Aperture Trial Library.aplibrary/Database/apdb reason:must scan subdirs|missed reservation|
13.06.12 07:50:43,331 com.apple.backupd: Finished scan
13.06.12 07:51:11,996 com.apple.backupd: 1.33 GB required (including padding), 763.52 GB available
13.06.12 07:51:11,998 com.apple.backupd: Waiting for index to be ready (101)
13.06.12 07:56:03,871 com.apple.backupd: Copied 1766 files (739.0 MB) from volume Macintosh HD.
13.06.12 07:56:15,835 com.apple.backupd: 1.34 GB required (including padding), 763.52 GB available
13.06.12 07:58:16,546 com.apple.backupd: Copied 1323 files (313.4 MB) from volume Macintosh HD.
13.06.12 07:58:45,338 com.apple.backupd: Starting post-backup thinning
13.06.12 07:58:45,338 com.apple.backupd: No post-back up thinning needed: no expired backups exist
13.06.12 07:58:45,592 com.apple.backupd: Backup completed successfully.
13.06.12 07:58:49,102 com.apple.backupd: Ejected Time Machine disk image.
13.06.12 07:58:49,661 com.apple.backupd: Ejected Time Machine network volume.
13.06.12 07:59:41,572 com.apple.backupd: Attempting to mount network destination URL: afp://[email protected]/WD_Backup
13.06.12 08:00:09,835 com.apple.backupd: Mounted network destination at mountpoint: /Volumes/WD_Backup using URL: afp://[email protected]/WD_Backup
13.06.12 08:00:30,871 com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN
13.06.12 08:00:33,932 com.apple.backupd: Disk image /Volumes/WD_Backup/silverstar.sparsebundle mounted at: /Volumes/Time Machine-Backups
Configuration:
Mac OS X 10.7.4
WD MyBook World Edition 2TB 01.02.12 with MioNet
Any idea what's wrong?

Time Machine does not recover old backups

Dear All,
I have a Time Machine disk for a long time (from the Leopard days) and have been using it without any trouble even after updating to Snow Leopard (iMac- intel).
However, a few days back I upgraded my system with the latest Snow Leopard release (over software update) to install the Apple Store application.
Now, today, when I put my Time Machine disk in, it correctly shows all the backup dates correctly (on the right hand side Time Machine index pane), but I could recover only files from my Snow Leopard backups. The Leopard backups, though shown correctly do not reveal anything when I click on the date.
I am feeling desperate as some of my important files are in Leopard backups. Any help would be welcome!

Madhurjya wrote:
Now, today, when I put my Time Machine disk in, it correctly shows all the backup dates correctly (on the right hand side Time Machine index pane), but I could recover only files from my Snow Leopard backups. The Leopard backups, though shown correctly do not reveal anything when I click on the date.
What you see in the "Star Wars" display depends on how you get there. If you're starting from a Finder Window, then entering Time Machine, be sure the Finder window shows something that was backed-up on Leopard.
Or, try the procedure in #E3 of [Time Machine - Troubleshooting|http://web.me.com/pondini/Time_Machine/Troubleshooting.html] (or use the link in *User Tips* at the top of this forum).
If nothing helps, try Repairing your backups, per #A5 there.
I am feeling desperate as some of my important files are in Leopard backups.
Do you mean you've been deleting things from your system, counting on Time Machine to keep the backups indefinitely? If so, that's NOT a good idea. See #20 in [Time Machine - Frequently Asked Questions|http://web.me.com/pondini/Time_Machine/FAQ.html] (or use the link in *User Tips* at the top of this forum).

Time Machine does not recognize previous backups in TC and starts new BUps

Time Machine (TM) seem not recognize previous back ups made in Time Capsule (TC) and begins a new copy of the back up every time, taking a lot of time.
The Time Capsule has an initial backup copy that I made several weeks ago. Subsequent backups seem to have disappear and the initial back up process is started over every time I make a backup, lasting several hours.
In the Control Panel of Time Machine, the Time Capsule disk has been selected as the place where the backup should be made.
The Time Capsule is not mounted in the desktop but can be seen as a Share resource.
Do you know why this is happening?
Is there any way that I can use the already existing initial backup in TC as a starting point for subsequent backups?
Your help will be much appreciated.

I resolved the problem of getting the computer to recognize that I had the authorization to change file names by myself. For anyone with a similar issue (insufficient authorization), the following are the steps I took to resolve the issue.
First, click on the external HD icon used for TM and chose "get info". In the info window goto the "Sharing & Permission" section where the +, - , action menu and lock are. Unlock the lock if it is locked. Verify that the Name used for the computer, user or administrator has "read & write" permission. Then go to the Action menu (the icon or design that looks like a sprocket) and choose "apply to enclosed items". In my case the HD went on noisily for a few hours before I decided to Force Quit. I then went back to the file name and changed it back to the way it was prior to my ill fated attempt to back up my other computer on the same HD.
I hope this will help anyone who has come across a similar issue.

Time Machine does not recognize older backups after restore

Leopard Server OSX.5.8, Mac Mini Intel
After a severe failure I had to restore the server (I used a fresh, spare Mini to restore to) from a Time Machine backup.
Everything went fine so far.
I tried to continue the backup on the same external harddrive, but the backup history is no more recognized by Time Machine, it want to backup the whole drive from the beginning.
The disk is full which is normally not a problem, as Time Machine deletes the oldest backups to deallocate space.
I don't want to lose the old history. What can be done to make Time Machine using this backup set again?

Hi Pondini,
I got it fixed today, thank you everyone for your help. The thing that ended up fixing it was deleting the hidden files ".com.apple.timemachine.supported" and ".002332b4a7fc" on the root directory of the time machine disk. Now my months worth of backups are viewable again!
I didn't find this on your website (maybe I didn't look hard enough). If it's not there, perhaps it would be a good thing to add to your site? Hopefully it will save a few people some frustration! Thanks for making the site - it looks like a great resource.
--Hayden

Time Machine does not recognize my backup

I just did a clean install of Lion on my 2.16 GHz Intel Core Duo iMac. Before I did that, I made sure that everything was backed up on an external drive through Time Machine. Now I want to restore everything and when I enter Time Machine, all that is visible for back ups are those that were done after the clean install of Lion.
Thankfully, when I open the files on the external back up drive through Finder, I can still see all of the back ups that were completed, including the most recent that I want to use to restore my iMac.
I am considering another clean install to start the process again.
I am not sure what to do next. Any ideas?
Thanks!
Dean

I don't think that you can just "copy" a TimeMachine Backup. You certainly can't drag them to the trash and then expext to empty it. You need to use the TimeMachine Application to work with the file.
Disks you can use with Time Machine
Time Machine Server Requirements
http://manuals.info.apple.com/en/TimeCapsule_SetupGuide.pdf
Pondini's Time Machine FAQ
Pondini has the best info on TimeMachine

Logic Board was replaced - Now Time Machine does not show previous backups

Hi
Bit desperate here.
My Apple store changed my hard disk and the logic board along with it.
I'm now aware that this means my MAC address has changed - which is what your Time Machine looks for when it tries to back up.
So now the backups are failing, and I KNOW there's a HINT offered on macosxhints.com
http://www.macosxhints.com/article.php?story=20080128003716101&query=Time%2Bmach ine%2Blogic
- but I have absolutely NO previous experience with TERMINAL and minute I try to re direct terminal to my Time Machine Volume : it tells me there is no such file or directory. It's all gobbledygook to me. I think the person that wrote it ASSUMED some previous knowledge of using terminal.
The things I DO know are: My MAC address number, and my TM Volume is called The BIG BACKUP (not Time Machine). It doesn't
Can anyone make this clearer for me, or indeed is there an easier way.
I know I could just tell TM to change disk and just star afresh - but I'm under the impression that it's very uneccessary for me to lose all my previous backups.
Hey, many, many thanks if you can help
Simon

Hello K.V.
(I'm having to come back to this when I get a minute at the moment)
Many thanks for your suggestions so far. Several things have occured:
Firstly I did what you instructed in your last post, that seem to let me go on without any further errors - so I then when back to my desktop - dismounted The BIG BACKUP and restarted the whole mac, remounting the The BIG BACKUP. I went to the 'Back Up Now' commend to test it and it failed, sayind it could not find the file or directory.
So this evening I started in terminal from scratch - when I got to the ls -al command I noticed that my old address was no longer in the list, it was on the line before the new address before (I also punched in the wrong mac address intially but spotted it and rectified my mistake .001f5beb34e5 being the correct one) as you can see from below it now says my old address is No such file or directory.
Here is a copy of what happened
Last login: Mon Jul 21 19:27:07 on ttys000
simon-evanss-imac:~ simonevans$ cd /Volumes/"The BIG BACKUP"/Backups.backupdb
simon-evanss-imac:Backups.backupdb simonevans$ xattr -p com.apple.backupd.BackupMachineAddress "simon-evanss-imac"
No such file: simon-evanss-imac
simon-evanss-imac:Backups.backupdb simonevans$ xattr -p com.apple.backupd.BackupMachineAddress"simon-evanss-imac"
simon-evanss-imac:Backups.backupdb simonevans$ cd ..
simon-evanss-imac:The BIG BACKUP simonevans$ ls -al
total 104
drwxr-xr-x@ 16 simonevans staff 612 20 Jul 22:44 .
drwxrwxrwt@ 6 root admin 204 21 Jul 21:13 ..
-r-------- 1 simonevans staff 16 24 Apr 23:56 .001f5beb34e5
-rw-r--r--@ 1 simonevans staff 6148 21 Jul 19:08 .DS_Store
drwx------ 3 simonevans staff 102 24 Apr 23:55 .Spotlight-V100
d-wx-wx-wt 3 simonevans staff 102 19 Jul 09:25 .Trashes
-rw-r--r-- 1 root staff 0 25 Apr 09:23 .com.apple.timemachine.supported
drwx------ 8 simonevans staff 272 21 Jul 19:32 .fseventsd
drwxr-xr-x@ 3 root staff 102 20 Jul 22:56 Backups.backupdb
-rw-r--r--@ 1 simonevans staff 1024 1 Jan 1970 Desktop DB
-rw-r--r--@ 1 simonevans staff 2 1 Jan 1970 Desktop DF
-rw-r--r--@ 1 simonevans staff 0 1 Jan 1970 Icon?
drwxr-xr-x 5 simonevans staff 170 24 Apr 23:55 MANUALS
drwxr-xr-x 5 simonevans staff 170 24 Apr 23:55 SOFTWARE
simon-evanss-imac:The BIG BACKUP simonevans$ sudo fsaclctl -p /Volumes/"The BIG BACKUP"
Password:
Access control lists are supported on /Volumes/The BIG BACKUP.
simon-evanss-imac:The BIG BACKUP simonevans$ sudo mv .001b639a9935 .001f5beb34e5mv: .001b639a9935: No such file or directory
simon-evanss-imac:The BIG BACKUP simonevans$ sudo mv .001b639a9935 .001cb37264bc
Password:
mv: rename .001b639a9935 to .001cb37264bc: No such file or directory
simon-evanss-imac:The BIG BACKUP simonevans$ sudo mv .001b639a9935 .001f5beb34e5
Password:
mv: .001b639a9935: No such file or directory
simon-evanss-imac:The BIG BACKUP simonevans$
Very confusing huh.
To be honest now, I guess my prime concern is if I've made any damaging changes to things I don't understand or not - and I think it may be best if I accept the Time Machine starting afresh from square one by clearing the external drive and re-directing TM to it. I could live with this I guess, so long as it worked.
What do you think?
Many thanks
Simon

HT3275 (After an OS upgrade to Mountain Lion) Time Machine does not find the backup on my time capsule; it insists on a new backup.

(Self explanatory, I hope.)

That seems unusual unless you changed drives.
If you upgraded the drive it sees the computer as a different one to the original backup..
I am not sure that it isn't better to do a fresh backup but you can try and inherit the old backup..
See Pondini
B5 B6 http://pondini.org/TM/Troubleshooting.html

Time Machine does not run automatic backups

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