Rdbackup is a small and easy to use backup system based on rsync and ssh. It works with a disk-to-disk backuping strategy where the data are stored on a single backup server. Rdbackup also provides a status monitoring through the SNMP interface.
esync-perl is a tool, which is designed to up-/download files via ssh to/from a rootserver. esync can encrypt/decrypt this files with gpg an manage public keys (it also has a key storage). You can use it for safe backup or to safely transmit files.