rsyncing using SSH running on a non standard port
This is how I backup my files to a remote server using SSH running on a non standard port and identifying using my RSA key.
$ rsync -au \
-e 'ssh -p 5555 -i /home/torstein/.ssh/id_rsa' \
/home/torstein/graphics/ \
myserver:/var/backups/graphics/
For an in-depth explanation of the various switches, see
man rsync
.