Hi,

Use clonezilla. You can create image of a partition/disk or clone harddisk/partition. its a debian based distro. Great tool.

In the following link you can see how to boot clonezilla from pen drive.

http://hackingwithdebian.blogspot.com/2009/01/triple-booting-from-pen-drive....

clonezilla.org

Regards, Sreenadh