So often people intend on backing up but never get it done. Others think it's not important, until AFTER disaster happens. Truly ask yourself, are there priceless memories stored in your computer? If so, are they backed up? If not, you are playing a game of chance that you will lose sooner or later. 

I cannot stress this enough, back up now, back up before it's too late. You will save money compared to having disaster recovery work, and will certainly thank me down the road. It's not a matter of if your hard drive fails, it's a matter of when.