In case you do not like to spend $28, for SuperDuper, tryrdiff-backup .
I guess it does not make the disk bootable, and there is no pretty GUI,
but are they worth the $28 ?
But yes, I feel also that DVD is not good for full backup. I tried that on my
PC, but it was hard.
FWIW I just cloned my entire OSX drive to a new internal drive using Prosoft "Data Backup" which I was given as a Christmas present. No problems with it. It just worked.