Setting Up Unison File Synchronization Between Two Servers On Ubuntu 11.10
This tutorial shows how to set up file synchronization between two Ubuntu 11.10 servers with Unison.
Unison is a file-synchronization tool similar to rsync, but the big
difference is that it tracks/synchronizes changes in both directions,
i.e., files changed on server1 will be replicated to server2 and vice
versa.