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I have done Time Machine backups to an external drive with my Mac plugged in and it appears to complete but the next time I begin a backup, I get a message that my previous backup was not completed because the computer was NOT plugged in.

MacBook Air 13″, macOS 11.6

Posted on Sep 27, 2021 12:22 AM

Best reply

BDAqua

Level 10

239,339 points

Posted on Sep 27, 2021 7:38 AM

Hmmmm, not really enough info to ferret out the problem, but next time it "finishes" try disabling TM by unchecking Backup Automatically.

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I have done Time Machine backups to an external drive with my Mac plugged in and it appears to complete but the next time I begin a backup, I get a message that my previous backup was not completed because the computer was NOT plugged in.

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