Is there software that will keep a folder in sync between two Macs? One is a PowerMac G5, running Leopard. The other is a MacBookPro running Snow Leopard. All I want is one folder where I can keep all my documents, and whenever I save it, that folder will get updated on the other Mac. Preferably over the internet too, if I'm not on the same intranet. Would a shared folder on the local network be the best option?