BACKUP GUIDE FOR NEWBIES
Sooner or later you will turn on your machine and you will discover everything you ever put into it (programs, images, word processing, tax data, your company's books, spreadsheets, your great Canadian novel) is gone. There are several ways this can happen:
Your hard disk failed.
A malicious program or virus erased your hard disk.
You accidentally erased files.
Your computer was stolen.
Your computer was damaged in a fire or flood.
Usually no amount of wailing, gnashing or teeth, or money will bring it back. You have to start all over from scratch. For many people this would be catastrophic. If you are one of these people, I strongly recommend doing monthly backups of your entire hard disk, and all of your data each night, or at least the data that recently changed. If you backup only changed data, restoring takes much longer since you must keep and restore all the intermediate backups as well as the most recent.
This site will give you all the options with how to do it and the pros and cons of each method
http://mindprod.com/bgloss/backup.html#BACKUP
http://mindprod.com/bgloss/backup.html