Using automator to keep folders synced

Hi,

I'm looking for a way to use automator to copy a file / folder to a shared server drive anytime anything is added to a specific directory.

More specifically, What I'm trying to do exactly is have all my music back uped from my itunes directory to an identical server drive. I a'm a mobile DJ, and I have have a lot of music that I need to have updated backups of. I currently have a server share already set up, and I manually copied everything from my itunes folder over to it, the only problem is; every time i update of modify some music, i have to go back into my itunes folder and sort by 'date modified' and copy just those files over.

The script needs to be able to copy whenever anything is added or modified to the itune directory, and needs to be able to overwrite existing data on the server backup folder.

Thanks in advance for any help!