Apple offers an excellent service for online storage, tools, and utilities. One of those utilities is Backup, which is designed to synchronize some of your key system settings. Any file can be added to Backup and be told to archive to your iDisk (the Internet storage that comes with a .mac account). Be sure to add your active project file to the backup list and tell it to archive every night. This is an excellent way to preserve a clean copy of the project file.
Like this tip? It comes from the book
Final Cut Studio On the Spot from Focal Press.