It's the kind of thing that everyone knows and figures should go without saying: You spend a lot of time on your work, so make an extra copy of it just in case, right? The average hard drive probably holds years' worth of information and work, some of it irreplaceable. So you're backing it up, aren't you?

Are you sure? Every standard computer here at Davidson comes with a backup system that's installed with the computer and configured to run automatically, but have you checked yours lately to be sure it's running? There are a lot of pieces required to make a regular, automatic backup work correctly, and even one item out of place can halt or block the backup. If you're not checking yours occasionally to make sure it's running right, you should be. Here's how.

• How to ensure your backups are running in Mac OS X 10.4


• How to ensure your backups are running in Mac OS X 10.5


• How to ensure your backups are running in Windows XP

The long and short of the matter is this: Never just assume your data is being backed up. Trust the backup system, but verify that it's working as it should be. And remember that the answer to the question "How often should I back up my important stuff?" is always "At least once more."