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DonP

macrumors member
Original poster
May 19, 2005
37
2
Socal
I have a 2TB Time Machine HD backing up 165GB from my iMac running Mojave.

If I "Enter Time Machine" I see the cascading windows indexed back to 12/29/17 which is when I started Time Machine.
But I'm only able to bring up a Finder window from today back to 8/18/19 . . Even though the earlier dates are visible on the slider control they are not available to view.

The screen shot of Time Machine from System Preferences confirms the "Oldest backup" as 12/29/17, and in the recent past I have been able to read back to the oldest.
I have successfully done a "Verify Backups" command for Time Machine.

I'm not sure how my backup got into this condition, but I'd really like to access some earlier backups from 2018 but I can't read earlier than 8/18/19.

Very much appreciate any suggestions on how to recover my backup and prevent this from happening again. Tnx
Screen Shot 2019-12-26 at 12.44.21 PM.png Screen Shot 2019-12-26 at 12.06.40 PM.png
 

HDFan

Contributor
Jun 30, 2007
7,303
3,351
Before you do anything I would get all of the data that you can from the drive. Messing with TM volumes can result in your not being able to access anything.

You can try running disk utility first aid on the disk. If that doesn't work you can then try some of the other disk recovery programs, such as DiskWarrior or TechToolPro. I've tried repairs in the past (there are some kn owledeable articles about fixing TM corruption on the web) but never got them to work. When I have a corruption problem now I don't bother trying to fix it, I just wipe the disk and start from scratch.
 

DonP

macrumors member
Original poster
May 19, 2005
37
2
Socal
Thanks for the tips. I did DU first aid on the TM disk early on but no success.

What I have discovered is I can go to /Volumes/Time Machine Backups/Backups.backupdb/Donald's iMac/ and find a series of dated folders from 12/29/17 through today each containing the complete TM backup for that date. I found the .jpeg file I wanted from 2018 and copy/pasted it to my desktop.

So whatever corrupted my TM archive the actual data is still there and readily accessible with Finder.

I am starting a 2nd TM backup on an external SSD to maybe prevent this problem in the future.

Screen Shot 2019-12-28 at 10.45.03 AM.png
 

HDFan

Contributor
Jun 30, 2007
7,303
3,351
The data may well be there. TM uses pointer structures. When doing a new backup if the data is already there it just points to the data rather than backing it up again. The problem comes when these links become corrupted.

A couple of other points:

1. TM on an SSD is a waste of money. You don't normally don't need that speed for TM. It's similar that way to cloud "glacier" storage.

2. Make sure your other backups are not TM.
 

HDFan

Contributor
Jun 30, 2007
7,303
3,351
It depends on how fast you want to be able to restore.

TM restores of small amounts of data won't be that much faster on a HD vs SSD. For large amounts of data, particularly a full restore, I would think a cloned HD restore will be faster than an TM SSD restore. TM restores are notoriously slow due to all of the links. Haven't tested though.
 

Brian33

macrumors 65816
Apr 30, 2008
1,474
372
USA (Virginia)
To the OP: Have you ever changed the name of your boot disk?
I think this might be the explanation -- IIRC a very similar thing happened to me after changing the name of my boot disk. There was a way to get to the older backups, though. I believe that it was going into Time Machine interface and hitting Shift-Cmd-C (Finder's shortcut for Go to Computer) and then the old disk name showed up in the TM/Finder interface.
 

ItWasNotMe

macrumors 6502
Dec 1, 2012
454
318
Are you sure the folder that had focus when you were moving through the index actually goes back to the start of your history?

Example:
I have folder created 27th Dec 2019 - If I use Time Machine with that as the focus then that is the earliest date I can move the index back to

If I set the focus to be boot drive then I can go back through the entire history
 

BrianBaughn

macrumors G3
Feb 13, 2011
9,852
2,506
Baltimore, Maryland
I think this might be the explanation -- IIRC a very similar thing happened to me after changing the name of my boot disk. There was a way to get to the older backups, though. I believe that it was going into Time Machine interface and hitting Shift-Cmd-C (Finder's shortcut for Go to Computer) and then the old disk name showed up in the TM/Finder interface.

It's such an easy thing to do and the user isn't warned about the consequences.
 
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