1/ booting with a live CD and a backup hdd (no mount of partitions)2/savedd if=/dev/hda | gzip | dd of=/path_to/save.gzrestoregzip -dc /path_to/saave.gz | dd of=/dev/hdaTo clone the two disks (hda is main, hdb is the backup)dd if=/dev/hda of=/dev/hdbdd if=/dev/hda of=/dev/hdb bs=512 count=1 (for the mbr)