Back up your data regularly—it's something you know you're supposed to do, but only until recently have many users start to take it seriously, thanks to OS X's Time Machine backup utility, which comes with the operating system.
If you don't have a backup routine, you should, and it's easy to do. This guide will help you get started with back ups, whether it's with Time Machine, a third-party app, or with disk clones. The fact that there are different ways to back up gives you more flexibility to find a routine that works best for you—and you should seriously consider using more than one method. Then, you'll have data redundancy, which can be very helpful should you not be able to access your primary backup of data.
The articles below will help you get started on your backup routine