Monterey 12.5.1 Update - Time Machine no longer works

Question

Monterey 12.5.1 Update - Time Machine no longer works

Upon restart after the update, I get the following behavior.

The normal prompt appears requesting the password to enable (TM is encrypted)
Upon putting the correct password in, there is no response for several seconds; then the prompt disappears and the Time Machine disk subsequently unmounts (or disappears from the desktop)
After a moment it appears again on the desktop, but this error message pops up:

Everything was working normally before the update.

Mac mini 2018 or later

Posted on Aug 17, 2022 7:43 PM

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Answer 1

ku4hx

Level 7

23,688 points

Aug 18, 2022 8:11 AM in response to Donnie Ashworth

I just finished bring five Macs up to 12.5.1 with zero issues.

If it were me, I'd do as the panel says and go from there. You don't really have a choice, and this could be a glitch that never repeats. But then, how old is the external drive? It may have a problem not related to an OS change.

Have you tried it one a different conputer? Apple or Windows

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Answer 2

Aug 18, 2022 8:18 AM in response to ku4hx

Thanks—yes, that's what I'm doing, reformatting and redoing the backup. Thankfully I have a second Time Machine drive that was not connected to the Mini at the time of the update, and it is functioning fine, so I still have older backups.

Both disks are Samsung T5 SSD's, and are fairly new. Just one of those things, I guess.

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Monterey 12.5.1 Update - Time Machine no longer works

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