If you need to Sync to folders over the internet (either PC or MAC) currently there was no free solution which was easy to implement. Finally BitTorrent has releases a software to do just that. Its free it can sync between different OS (MAC/PC/Linux). Its easy to setup and its fast as it uses BitTorrent distributed technology.
So Now I can have a back up of all My Media (Photos / Videos) files over the Internet on another location for safe keeping. It is still in experimental mode but it works beautifully check out more at: http://labs.bittorrent.com/experiments/sync/get-started.html