@Simon_Arnold3: thanks for proposing guest as user and password. I have tried this, but get ‘connection refused’ errors from ROCK. Does ROCK actually provide a rsync-daemon? This post recommends to run rsync over smb, which was my initial attempt and is very very slow - after one hour, it had checked just a handful of my several thousand files. Thus knowing whether ROCK has an built in rsync daemon and how to get it to work would be very helpful.