Backup also notes a copy that is not located where the computer is. Even if in the same building a fire or other disaster will destroy both.
In your case, theft, lightning strike and what you noted are common issues. But drive failure is a NON ISSUE since it is a backup and not "storage."
I've written about my backup many times but suffice it to say that it includes multiple copies, places and on no less than 3 types of media from USB hard disks, DVDRW, memory keys and networked disk space. I also employ the family backup in that my photo collection is mailed occasionally to my family members so to lose that would mean an almost global catastrophe.
I just recently bought a Seagate Free Agent 320gb 2.0 USB 7200rpm for storage and back-up.I have a Dell B110 80gb 512mb I use mainly for photos,web surfing and some selling on e-bay.My question is should I use Disk-Wizard to back-up my system,I do back-up my system with CD's only have a CD-RW drive.I know a little about computers but I am confused when it comes to the different solutions I have for backing up my system.Also is it a good idea to leave the Ext.HD pluged in all of the time?I worry about lossing data if I have a system crash or virus(I have anti-virus).I would apprecate any feed back on this.