Time Machine fails with "unable to create a snapshot of the disk" after upgrading to Monterey.

After upgrading to Monterey, Time Machine backup fails. For TM, I'm using a USB-connected drive on my mac Mini with a 3T volume (APFS, case-sensitive) which is completely empty. I deleted all previous local snapshots in case that was part of the problem, but no luck. Within seconds of a backup attempt, I get a message "Time Machine could not back up the disk “Macintosh HD” because a snapshot of the disk could not be created.".

Any suggestions?

Posted on Oct 28, 2021 7:23 AM

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1 reply

robinpdx Author

Level 1

8 points

Oct 28, 2021 7:53 AM in response to robinpdx

Resolved! Found this article and followed the steps to remove AppleInternal and now TM is fine again.

https://eclecticlight.co/2020/01/31/whats-this-new-appleinternal-folder-then/

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Time Machine fails with "unable to create a snapshot of the disk" after upgrading to Monterey.

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