This is by far the most awesome feature of any Apple computer. The Time Machine feature.It’s an automatic backup, and let’s you go back in “time” to any backup of your computer. My 1TB Western Digital NAS happens to be compatible with it! It automagically backups your computer to the hard drive over the network. The initial backup takes a long time, but that’s to be expected with any backup. I plugged my MacBook into my Gigabit router to help with the first backup.
You need: A NAS compatible, or a Time Capsule from apple, a router, and an Apple Computer.
Here’s some more information on Time Machine: Apple