Please be aware that rdiff-backup connecting to rdiff-backup uses the
same mechanism as rdiff to sshfs, ie: ssh.
this is more a question than an affirmation because I do not know
anything about the rdiff's mecanisms, but so far I know :
* with a client/serveur configuration only the files infos and diffs
go throw the ssh tunnel.
* If you mount your partition (or sshfs mount if you want) every
file access will go on the network, which is more slower because
using more network ressources.
Am I completly wrong ? If yes tell me, it were effectivly more easier to
mount everything on the backup server :)