Unitrends cold bare metal backups perform a block-level backup of a server's boot disk. This backup allows you to restore your operating system in the event of a disaster. Unitrends recommends using the master backup to create the bare metal media when possible, but in some cases you may have to perform a cold bare metal backup. This requires the server to be offline during the backup, and is necessary on GPT-partitioned Ubuntu 12.04 systems.
Note: On Windows systems, cold bare metal backups are necessary if using dynamic disks or GPT partitions. Use the Linux cold bare metal procedures for these Windows systems.