Do you have backup copy of your data? If your hard disk drive breaks, you can buy apps and musics but you can never buy back original data like documents, photos, emails, etc. Sync!Sync!Sync! helps you to make copies of your data by synchronizing two folders. It's very easy to set up, and once this is done, all you have to do is push a button. Of course, Sync!Sync!Sync! can also run automatically while you are away from home, or sleeping. It's also AppleScript compatible, so you can make your own backup flow. There are some sample scripts in the package, so please try to find out what system works best for you. Mac OS X 10.5 has an elegant backup system ("Time Machine") but if you want to use it, you have to prepare a huge empty HDD. If you don't have one, or you want to make backup through a network (like iDisk), Sync!Sync!Sync! is a better choice.