There is a user backup which performs the backup to /mnt/backup
(ext4 partition on 4TB Western Digital harddrive). This is the only
user with write-access to /mnt/backup.
There is a group backup that can read /mnt/backup.
The user anto is part of the backup group.
The following commands are here as a memo for when the server is reinstalled.
Add user anto to group backup:
# adduser anto backup
Add group:
# addgroup backup