Here is the link: http://clonezilla.org/
There are many ways to use Clonezilla to backup system, CD, USB flash drive, Hard drive, PXE server. I use USB flash drive.
Partition and format USB stick drive
fdisk /dev/sdb
/dev/sdb1 w95 fat32
/dev/sdb2 linux
/dev/sdb5 linux
Install Clonezilla live to USB flash drive
download Clonezilla: http://clonezilla.org/download/sourceforge/alternative/iso-zip-files.php
make /dev/sdb1 bootable
mount /dev/sdb1 /media/usb
uncompress the file: unzip clonezilla.zip -d /media/usb
Boot from USB flash drive
Choose ToRam option to start Clonezilla live
Choose source disk and target disk
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