I'm running the following command:
rdiff-backup --remote-schema '%s' 'sudo /usr/bin/rdiff-backup --server \
--restrict-read-only /'::/etc /var/backups/hosts/derp
It's backing up /etc from localhost and putting it in /var/backups/hosts/derp just fine. I have no idea how to get this to run and pull the files from another host.