using deja dup with rsync server

I used Deja Dup on Ubuntu since years with an remote NFS share. Now I have a new home server, which also runs an rsync daemon. How can I connect deja Dup to this daemon instead of NFS? I found out how to connect duplicity from the command line of the client to the remote rsync daemon: duplicity --no-encryption testfile.txt rsync://server::module/backupfolder/ This works fine, the client gives out plausible Backup Statistics, no errors and the backup arrives on the server, so I consider my rsync server running and configured correctly and reachable by the client. But when I put rsync://server::module/backupfolder/ into the client's Deja Dup settings as backup location, it says after starting a backup "location cannot be mounted" or similar. Is the URL syntax wrong? What else am I doing wrong? Isn't Deja Dup supposed to work the same way as duplicity, since it uses duplicity? *edit: I corrected the paths, but still no luck connecting with deja dup