While Macs may be renowned for there stability and reliability it does not mean that you can expect to never have a problem. I myself am working on my third hard-drive for my Mac. And, while this situation may be far from the norm, it helps to be prepared for the worst. The most important part of any computer system is the information that it stores for us. This data could be anything from treasured family photos to important financial documents; either of which would be devastating to lose. Luckily, users have a built in utility which can securely back up their important data. "Time Machine" is a simple to use, incremental backup utility which can use a variety of devices to back up your data.