From http://www.thefreecountry.com/utilities/backupandimage.shtml
The hard disk and partition imaging software take a snapshot of your hard disk so that you can restore your system at a later time to the exact same state the system was when you imaged the disk or partition. This is useful for system recovery in case of a hard disk disaster. The term "image" is used because such software often copy the state of the hard disk sector by sector to your image. Hence if your hard disk was (say) defragmented with certain software occupying certain sectors when you backed up, it will be returned to that same state when you restore your backup. The image utilities often do not allow fine control what you backup - you can specify the partitions or hard disks to back up, but you usually will not be able to specify which folders to exclude or include. They are useful for backing up your system drive or partition, that is, the drive that you placed your operating system on. Hard disk imaging software are sometimes also used to clone a hard disk to another (useful for the times you change or upgrade your hard disk).
On the other hand, the hard disk, folder and files backup software listed here allow a finer control over what you back up. You can selectively backup and restore (say) your documents and email while omitting other files and directories. Some of the utilities allow you to schedule your backups, so that you can be sure that your important data are backed up periodically (for example, daily, weekly, monthly, etc). Depending on the utility, it may or may not support the backup of your system drive (the drive you booted from).
Note that commercial backup and imaging software, like Paragon Backup & Recovery Suite, Acronis True Image, and Terabyte Unlimited's Image for Windows (free trial download) are not listed here, other than being mentioned in this introduction.
Favorite : Bacula
Another link http://www.downloadsquad.com/2008/10/12/13-great-free-backup-programs-for-windows-mac-and-linux/
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