For many folks, backing up their data is a lot like flossing. It's a chore and not the most pleasant way to spend a few minutes. You know it's important for good personal or computer hygiene, but you probably don't do it as often as you should. But once teeth start falling out or you lose wedding pictures, contacts, and tax records due to a computer crash, you become a lot more diligent with your flossing and/or your backing up. In fact, I'd wager that backing up is even easier than flossing now.
Here's a quick video on why it's important to back up your most important files and how Norton 360 makes it as easy as 1-2-3.