I want to be able to create a scheduled full backup of C: to an external USB hard drive in such a way that the USB image is bootable. In the case of an internal h/d crash, I want to install the external drive in the PC and begin using it as the primary, ultimately replacing the external drive and continuing the backups. I'm unsure of how to implement such a scheme. I can't use differential/incremental backups as it creates multiple images on the external drive. Should I be using the disk clone tool instead?