What should I use for backing up/cloning a linux computer

What should I use for backing up/cloning a linux computer?

Ya there are plenty.

Freeghost
http://sourceforge.net/projects/freeghost/

Partimage
http://www.partimage.org/Main_Page

This one is great but is not capable of cloning from a larger disk to a smaller disk, working with individual disk partitions, or creating or restoring image files (locally or otherwise). If thats not your situation this is what Id recommend.
http://www.miray.de/products/sat.hdclone...

http://www.feyrer.de/g4u/
http://clonezilla.sourceforge.net

Personally I like clonezilla, but whatever does it for you.