MacBook Pro 2023 backup on Time Machine takes too long, way way longer than before

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MacBook Pro 2023 backup on Time Machine takes too long, way way longer than before

Hello, I've moved from the previous MacBook pro model to the new one, 16'' November 2023 M3 Pro, 36 GB with Sonoma 14.4.1, 2TB.

I usually made a backup with Time Machine in half an hour - one hour with the previous Mac.

The first backup with the new Mac Book Pro took around 24 hours.

After 2 days I'm trying to make a new backup and in 2 hours Time Machine copied only 200 MB and we're at 59% of the process with time increasing. I've done basically nothing since the last backup so I can't understand this crazy behaviour.

I've tried to check the logs and what I've seen on the console is that I may have a problem with the data persistence service (CoreData) in the macOS operating system. In particular, there appears to be a sandbox restriction issue that prevents the process from accessing the data persistence service. But I don't know if it's related.

A Disk Utility S.O.S. gives nothing, only 4 errors on the backups on the disk snapshots, like this one (let me copy-paste):

warning: inode (id 3193416): Resource Fork xattr is missing for compressed file

warning: snapshot fsroot / file key rolling / doc-id tree corruptions are not repaired; they'll go away once the snapshot is deleted

Any suggestion would be greatly appreciated!

Nicola

MacBook Pro 15″

Posted on Apr 5, 2024 2:31 PM

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Answer 1

Apr 6, 2024 10:18 AM in response to Wepesto

For readers who find this discussion by searching...

Another thing you can do is to ADD an additional drive to the backup set. Then every other backup goes to every-other drive.

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Answer 2

Apr 5, 2024 7:05 PM in response to Wepesto

when you change computers or make major upgrades, the backup set already on disk and the new incoming backups have to pass by each other. it can be like two elephants trying to pass through a narrow hallway.

If your drive is at least the recommended 2.5 times the size of what needs to be backed up, your old backup set will get its oldest entries consolidated, again and again, until the new backup has room to pass by.

The less extra space there is, the longer this consolidation can take. It is an iterative process that seems to proceed slowly, because you can't just DISCARD old backup instances -- they contain copies of files that might still be needed in the backup set.

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Answer 3

Wepesto Author

Level 1

8 points

Apr 5, 2024 11:41 PM in response to Grant Bennet-Alder

Thanks for the suggestion, it’s what I did as first try. After moving to the new Mac I’ve formatted the Time Machine external disk which is 4TB, so the new backups worked on a fresh disk.

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MacBook Pro 2023 backup on Time Machine takes too long, way way longer than before

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