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.

moonguy Author

Level 1

8 points

Time machine dismounts drive after backup

mac with m1 chips

OS 14.2.1

Backup drive USB anf formatted APFS

After long back up it starts hourly incrementals but when finished dismounts the back up drive

Computer can't find drive again until drive powered down and restarted.

MacBook Pro (M1, 2020)

Posted on Jan 5, 2024 1:11 PM

Similar questions

Time Machine forgets disk, does not execute, or executes mysteriously On Ventura and for a long time, backups have become impossible to manage. I thought it was the drive and I purchased a new one and overkill. I formatted a number of times through Time Machine itself. The geist is: Time Machine forgets the disk. If I 'add disk' and select my back up disk, then the disk shows in the list in the TM configurations. If I close the config window, when I open it again, the disk is not there. If I wait long enough with the config window still open, as I did while typing this post, the disk disappears from the list in the meantime. Time Machine does not execute. It does not back up, even if I select manually 'backup now', when the drive is present in the config window list, nor if I select 'backup now' from the context menu of the drive icon in the finder (including desktop). Time Machine backups are not accessible from TM itself. I can't enter TM backups from menu bar drop down menu, because it does not believe there is any backup disk to browse. However, if I open the backup drive through a finder folder, the finder offers me the option to browse my backups, and at least at a surface level, it seems to work. Finder sees the old backups and is able to make them accessible. Note: All along the drive is available and is recognised as a backup disk type by the finder. Rebooting does not work. Disconnecting before rebooting, re-connecting after rebooting does not work, nor any other kind of dark art makumba ritual. My backup drives both work, file systems are fine, the problem comes back immediately if I format them and start from scratch. My provisional conclusion: The Finder side of things works and finder does what it is supposed to do with the drive. Drives are fine. So it is solely the TM code/application/GUI side of things that does not work and it shows as a memory/execution problem. Is there a way to hard reset the TM settings or any other 'deep' setting that I can do something to?
234 2
After successful initial backup to Time Machine Drive, Time Machine Preference Pane show no backup. help,please I use a Samsung T7 1TB external SSD as Time Machine drive. It filled up, after three months. A few days ago, backup continue to be completed, but backup date stuck, and it show June 8, 2021 as latest backup even though the real lates5 backup is June 11. sos I stop using the drive, erase it, reformat it to HFS+ and use it as TM drive, then I start the initial backup. The first backup completed successfully, but Time Machine preference land show that there is no backup. I try to reboot, reinsert the drive but that do not help. My Mac is an m1 MacBook Pro how to I fix this mess? Help, please.
244 1
Time Machine stuck on preparing backup My Time Machine is stuck on preparing backup for both my Western Digital external drives. This is a recent issue and I don't know it's related to the recent IOS update to Big Sur. Any advice would be greatly appreciated. I've erased one of my backup drives in hopes that starting fresh would help, but so far no luck.
516 6

1 reply

kaz-k

Level 9

50,232 points

Jan 7, 2024 12:45 AM in response to moonguy

Hi,

Running FirstAid of DiskUtility on your backup drive could solve the issue.

Time machine dismounts drive after backup