Restoring a mass storage device, including the corresponding data blocks stored thereon, to a state in which it existed at a prior instant in time to minimize the data loss caused by data blocks becoming corrupt or lost. After a mirrored or backup copy has been made, data blocks that are to be overwritten...http://www.google.com.au/patents/US20020112134?utm_source=gb-gplus-sharePatent US20020112134 - Incrementally restoring a mass storage device to a prior state
