Clonezilla LiveCD, popularly known as Clonezilla, is an open source (free) Linux distribution based on the Debian GNU/Linux operating system.
Clonezilla, based on DRBL, Partclone and udpcast, allows you to do bare metal backup and recovery.
Two types of Clonezilla are available, Clonezilla live and Clonezilla SE (server edition). Clonezilla live is suitable for single machine backup and restore.
One of Clonezilla Live’s most unique features is that it clones only the sections of your hard drive that have actually been used. Any empty folders simply don’t get copied, which is convenient and a great space-saver.
In order to run Clonezilla LiveCD, you will need to burn the ISO image to a blank CD or deploy it on a USB flash drive with a dedicated utility, such as Unetbootin.
Clonezilla saves and restores only used blocks in the hard disk. This increases the clone efficiency. With some high-end hardware in a 42-node cluster, a multicast restoring at rate 8 GB/min was reported.