I only back up SME or SUSE boxes using rsync over ssh. From the backuppc mailling list ....
The other reason I'd like to use ssh is that I use the -C flag to get compression with rsync transfers, but this isn't possible with windows because of the bug in the cygwin version of rsync/ssh. My current workaround is to keep a Linux box at each remote office and first rsync the windows machines to samba shares on the Linux server, then let backuppc back up the Linux machine using rsync over ssh.
Les Mikesell 17/12/04 15:11
I haven't looked at stunnel though, only openssh.
Damian