Is there any worse feeling in the entire world than when your computer gets a virus or the power goes out while you are working on a project and you realize in that split second that you have just lost all the work you have been working on for days and sometimes even weeks?
The very thought of sitting down and re-doing all of that work again can be overwhelming and frustrating all at the same time. And what is even worse is if you cannot redo some of the stuff you have lost. Digital pictures from that vacation down in Cancun can never, ever be replaced.
A disk backup of your important items is a must for anyone who values their time and their work. Everyone should make backing up their important documents, projects, pictures, movies, music, etc. a daily habit. Make it as regular as prune juice.
Many people do five things every night before they go to bed: they eat a quick snack, they brush their teeth, wash their face, take a vitamin, and do a disk backup of all their important stuff on their computer.
Get into the habit. It's something you'll never regret. Bloggers speaking about disk backup can be found at sites like taragana and easeus-backup.