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.
Read more: http://www.howtoforge.com/setting-up-unison-file-synchronization-between-two-servers-on-ubuntu-11.10