http://www.howtogeek.com/howto/19141/clone-a-hard-drive-using-an-ubuntu-live-cd/
Whether you’re setting up multiple computers or doing a full backup,
cloning hard drives is a common maintenance task. Don’t bother burning a
new boot CD or paying for new software – you can do it easily with your
Ubuntu Live CD.
Not only can you do this with your Ubuntu Live CD, you can do it
right out of the box – no additional software needed! The program we’ll
use is called
dd, and it’s included with pretty much all Linux distributions.
dd is
a utility used to do low-level copying – rather than working with
files, it works directly on the raw data on a storage device.
sudo fdisk –l
sudo dd if=/dev/sda of=/dev/sdc