A method and system wherein data is structured so that writes may be continuously duplicated and a protected volume may be restored to a particular point in time as desired. Writes are continuously duplicated on a secondary volume and organized into delta maps. The delta maps indicate which memory blocks...http://www.google.se/patents/US7315965?utm_source=gb-gplus-sharePatent US7315965 - Method and system for storing data using a continuous data protection system
