US Patent 8676759 Continuous data backup using real time delta storage

A continuous data backup using real time delta storage has been presented. A backup appliance receives a backup request from a backup agent running on a computing machine to back up data on the computing machine. The computing machine is communicatively coupled to the backup appliance. Then the backup appliance performs block-based real-time backup of the data on the computing machine. The backup appliance stores backup data of the computing machine in a computer-readable storage device in the backup appliance.