Comodo Backup and Restore question

If I create a system backup (DISK, PARTITIONS, MBR) going to a removable media , how do I use that backup to restore my system if the system is corrupted (unbootable)? This is a standalone PC not on a network. I’m running windows XP media center SP3.

You can use a BartPE CD with CBU.exe only.
A rescue boot CD will be available in a later version.