Backing up data - why you need to do it

"This is one of the most important, yet also one of the most neglected areas of computing. Backing up your data should be at the top of your computer maintenance list, right next to Virus Protection. Without data backup or virus protection, you are running the risk of losing your data. And it will happen, don't think that you don't have to worry about it."

Visit this website for an excellent article on backing up date for home PC's -- why you should do it, how to do it and more.