I’m going to bed now, but read carefully all the topic when you have time, to really understand all the steps.
In the above examples, if you’d need to undo all the actions, undo all starting by the end.
So sudo systemctl disable data-backup.mount
, then systemctl show -p ActiveState -p SubState --value data-backup.mount
to check the status, and sudo systemctl stop data-backup.mount
Good luck!