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If Time Machine can’t unmount your backup disk

Try these suggestions if you can’t unmount your disk after a Time Machine backup.

Make sure that the backup has stopped.
Make sure none of the disk’s folders or files are open in the Finder.
Check to see if Spotlight is indexing (indicated by a blue bar above Spotlight search results). Try unmounting the disk again after indexing is complete.

Your Mac also unmounts the backup disk if you restart your Mac or log out.

See alsoVerify your backup disk on Mac Start, pause, or resume a Time Machine backup on Mac

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