Casper makes maintaining a backup replacement disk for your PC easy by creating a complete, immediately-bootable copy of your PC's hard disk, including the operating system, applications, settings, and all of your data. If your PC's hard disk fails or becomes corrupted, boot your computer directly from your backup hard disk and you're up and running again in seconds. No need for time-consuming, risky image archive restoration. Intelligent, exclusive automation technologies including SmartStart and SmartSense also make maintaining multiple, fully bootable, backup replacement disks for a computer using inexpensive external USB, Firewire, or eSATA drives effortless. Schedule the backup to be performed at any time, or perform the backup in the background while you continue to use your computer. Casper also makes upgrading your PC's hard disk to a new disk for increased speed or storage capacity a breeze.