Unmount after backup doesn't work

NethServer Version: 7.9.2009
Module: Backup

I think I have a similar problem to the following thread:

Since two days I get a mail that it is not possible to unmount the backup location

umount: /mnt/backup-projectmanagement: target is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

If I try to unmount manually, I get the same error. My fault, I navigated to the folder and tried to unmount. So manually unmount works.
I’ve found nothing at messages and backup log.
Has somebody an idea?

I don’t have an idea, but I’m having the same thing happen, also when using Restic for backup.

After unmounting it manually once, I didn’t get the mail with the unmount error again. So it is solved for me.

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