Time Machine Help

WinterWolf90

macrumors 6502a
Original poster
Jan 18, 2014
563
395
I erased my drive to and started fresh with the Catalina installation, but now time machine won't let me browse my prior backups and it starts over from scratch even using the same drive. Does anyone know how to make it continue from the old drive.
 

jgrove

macrumors member
Jul 18, 2006
64
12
I erased my drive to and started fresh with the Catalina installation, but now time machine won't let me browse my prior backups and it starts over from scratch even using the same drive. Does anyone know how to make it continue from the old drive.
Were the TM backups made with a version prior to Catalina?
 

WinterWolf90

macrumors 6502a
Original poster
Jan 18, 2014
563
395
Were the TM backups made with a version prior to Catalina?

yes, but I've never had problems with it looking at those backups before and it shouldn't matter should it? my Mac is from 2015 and its always done backups on the prior versions.
 

IowaLynn

macrumors 65816
Feb 22, 2015
1,458
315
Starting with another freshly erased drive with Catalina avoids problems.
 

matram

macrumors 6502
Sep 18, 2011
267
106
Sweden
I believe TM uses partition UUID to ”connect” the disk to the backup. When you erased the disk I assume you got new UUID.

You can always mount your old backup if you want to retrieve files. Why not start a new backup and just keep your old backup at the same time.
 

WinterWolf90

macrumors 6502a
Original poster
Jan 18, 2014
563
395
I believe TM uses partition UUID to ”connect” the disk to the backup. When you erased the disk I assume you got new UUID.

You can always mount your old backup if you want to retrieve files. Why not start a new backup and just keep your old backup at the same time.

Correct and I have tried to do things I have read online to reestablish it, but nothing seems to work. I have erased my drive twice before and never had issues, it always let me view them, so there wasn't any issue until now. I may erase it again and see if it recognizes it. I dunno.

Starting with another freshly erased drive with Catalina avoids problems.
this doesn't really help my issue.
 

matram

macrumors 6502
Sep 18, 2011
267
106
Sweden
The only thing I have personally done was moving the TM backup to a new disk. In that case, when adding that old backup on the new disk in the TM menu, I was warned that UUID did not match but I was allowed to add the disk.

Have you checked the TM logs, they are quite extensive. In terminal, type
log show --predicate ´subsystem == ”com.apple.TimeMachine”´ --info
 

IowaLynn

macrumors 65816
Feb 22, 2015
1,458
315
Correct and I have tried to do things I have read online to reestablish it, but nothing seems to work. I have erased my drive twice before and never had issues, it always let me view them, so there wasn't any issue until now. I may erase it again and see if it recognizes it. I dunno.



this doesn't really help my issue.
Get a new drive Don’t use the one you use to use for TM

Get in the habit of also making clone - CCC or other method.

Forget using your old TM.
 

MacManiac76

macrumors 68000
Apr 21, 2007
1,552
348
White Mntns, Arizona
From what I remember during the beta period, Time Machine backups from an OS prior to Catalina will not show up on the Time Machine drive when viewing in Catalina. You could try making a new partition for Mojave and try to install Mojave using the restore from Time Machine option and see if they show up there. Not sure why Apple thinks it's a good idea to not have them show in Catalina. If this is the case going forward, it could render many users' Time Machine backups useless if they go back quite aways.
 

WinterWolf90

macrumors 6502a
Original poster
Jan 18, 2014
563
395
From what I remember during the beta period, Time Machine backups from an OS prior to Catalina will not show up on the Time Machine drive when viewing in Catalina. You could try making a new partition for Mojave and try to install Mojave using the restore from Time Machine option and see if they show up there. Not sure why Apple thinks it's a good idea to not have them show in Catalina. If this is the case going forward, it could render many users' Time Machine backups useless if they go back quite aways.
The odd thing is that it can see some of them, but not all
 

WinterWolf90

macrumors 6502a
Original poster
Jan 18, 2014
563
395
From what I remember during the beta period, Time Machine backups from an OS prior to Catalina will not show up on the Time Machine drive when viewing in Catalina. You could try making a new partition for Mojave and try to install Mojave using the restore from Time Machine option and see if they show up there. Not sure why Apple thinks it's a good idea to not have them show in Catalina. If this is the case going forward, it could render many users' Time Machine backups useless if they go back quite aways.

I might try and just go back to Mojave and see if there are issues with it there, there weren't from when I last checked.
 

interstella

macrumors regular
Sep 29, 2013
189
79
Suffolk, England
Please don't regard this as thread hijacking but I also have odd TM behaviour with Catalina. I backup to a synology NAS but since installing Catalina I only have one day's backup at a time. I deleted my old backups and started again yet the problem still persists. Can't help wondering if this is somehow related to the OP's query?
 

WinterWolf90

macrumors 6502a
Original poster
Jan 18, 2014
563
395
Well after restarting to a Mojave backup my time machine works well, so it does appear Catalina just isn't viewing older backups, maybe because of the 64 bit stuff, I dunno.