I currently have 2 hard disks with one of them acting as backup only. I also have my data backed up on CD-RWs. I'm wondering if it's really necessary to have 2 backups; can both my hard disks suffer simultaneous fatality?
If someone steals your PC, both your hard disks will go and with it ALL of your data, backup as well. You need a backup stored separately from your PC, preferable at another location in case of a fire.