Backup important files on a regular basis…

We all know we're supposed to do this but many of us don't. Backup important files on a regular basis and store the backups in a safe place. (Preferably off site.) You can backup files to removable disks/drives or save copies to network shares. It's not wise to back up to the same hard drive or computer, in case something happens to that device. Unfortunately, it's not a matter of "if" you will lose files one way or another; it's a matter of "when".   Source: SANS Institute