This works for me, try it as a test with some empty qube:
$ ls /etc/qubes/backup -la
total 16
drwxrwx--- 2 root qubes 4096 May 18 01:54 .
drwxr-xr-x 8 root root 4096 May 10 20:44 ..
-rw-rw-r-- 1 user user 104 Jun 15 14:40 qubes-manager-backup.conf
$ cat /etc/qubes/backup/qubes-manager-backup.conf
compression: true
destination_path: /tmp/
destination_vm: vault
include:
- personal
passphrase_text: 'test'
$ qvm-backup --profile qubes-manager-backup
Hey doing this has worked! Thanks!
$ qvm-backup --profile only_dom0
The only_dom0.conf file resides in /etc/qubes/backup/only_dom0.conf and its filename owner/group and permissions are the same as in your example.
Now I am just wondering whether the source of the bug I had was:
1/ not having the passphrase_text string within single quotes (’)
2/ not designating the --profile argument as single file name (instead, I always gave the full path with .conf file extension)