Question Backup exclusion

[Hitradio]

I have with my Plesk VServer over the backup manager as admin a backup furnished. This works so far into the local directory / private-backup. Now I would however a customer path (because there will be many files will not lie
Must be secured). To do this, I can put a check mark and in a field the Directory. Unfortunately, this has so far been on all imaginable Do not work. What do I have to enter there when I /var/www/vhosts/markusmueller.de. Either the whole account or At least the web directory. Maybe it is just a thought-provoking and it does not have to
The complete path pure. Also tried I /markusmueller.de/markusmueller.de/*