so this means, duplicacy will orientate itself on the drive letter? Very bad idea. If a user does not uses this tool you mention things may go wrong. Duplicati has an easy solution for this:
You can just place an emtpy file with a random name on the drive. Duplicati will then use this file to get the backup medium right. Simple and reliable.
I just saw that a check can be scheduled. This can be done once a weak and would nearly met my criteria but the pc has to be running at the time there I scheduled it.
This brings me back to the catch up of the missed backups