Thanks! I did see in my configure.php file that one of the paths is pointing to a folder "admin" that doesn't exist. I was afraid to change that in case it affected something else. However after seeing your response I guess I should try updating that path? In the meantime I created an admin dir with a backups dir under it just to get the add-on to work, but don't want to leave it like this.

And this tells me that the paths in your /clay/includes/configure.php file are pointing to the old /kunden/..../admin/... folder, instead of the correct actual folder.