Clonezilla is a bootable CDROM designed for partition backup and restoration. Unlike SystemRescueCD, Clonezilla Live doesn't contain an array of utilities, rather it is a single, focused tool. However, if you're interested in simply backing up or restoring whole partitions to or from files, or copying one partition onto another, Clonezilla might be just what you're looking for.
There are two primary uses for a tool such as this one: backup and subsequent restoration in the event of a mishap or creating a clone of an existing system. So, you could install Linux on one machine, backup the entire disk to a file and then copy the setup to other machines. On the other hand, the partition imaging allows you to do a system backup that can restore a complete system, unlike a traditional backup utility that can only restore your files.