You're probably familiar with the popular proprietary commercial package Norton Ghost, and its OpenSource counterpart, Partition Image. The problem with these software packages is that it takes a lot of time to massively clone systems to many computers. You've probably also heard of Symantec's solution to this problem, Symantec Ghost Corporate Edition with multicasting. Well, now there is an OpenSource clone system (OCS) solution called Clonezilla with unicasting and multicasting!
Clonezilla, based on DRBL, Partition Image, ntfsclone, and udpcast, allows you to do bare metal backup and recovery. Clonezilla live is suitable for single machine backup and restore. Clonezilla saves and restores only used blocks in the harddisk. This increases the clone efficiency.
Clonezilla Live features
The alternate version is based on Ubuntu Linux instead of Debian. It includes support for hardware that requires non-free firmware, and supports uEFI secure boot (64-bit version only).