Clonezilla 1.2.10-14 is an OpenSource clone system (OCS) solution with unicasting and multicasting. It 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. While Clonezilla SE is for massive deployment, it can clone many (40 plus!) computers simultaneously. Clonezilla saves and restores only used blocks in the harddisk. This increases the clone efficiency.
Clonezilla Live is a Debian-based live CD containing Clonezilla, a partition and disk cloning software similar to Norton Ghost. It saves and restores only used blocks in hard drive. With Clonezilla, one can clone a 5 GB system to 40 clients in about 10 minutes.