You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

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

Top-ranking reply

BDAqua

Level 10

245,483 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.

View in context

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.

Similar questions