Clonezilla - Clonezilla is a suite of software that's designed to allow you to back-up and image new hard drives with your data.
Drive SnapShot - A fast and inexpensive imaging tool. Very simple yet powerful, following the KISS methodology.
Macrium Reflect - Macrium Software - the creators of Macrium Reflect backup, imaging and cloning software.
Active@ Disk Image - Data Backup Software helps you to backup whole disks and partitions and to restores them when needed
AOMEI Backupper - AOMEI Backupper is a software created to help a person backup, restore, clone, and sync their entire Windows system.
Time Machine - Time Machine is the breakthrough automatic backup that’s built right into Mac OS X.