Clonezilla Live

“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.”

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