A method for tracking changes on a primary volume in a continuous data protection system writes data to the primary volume. A copy of the data is written to a secondary volume, the secondary volume including all writes made to the primary volume. Each write made to the secondary volume is mapped in a...http://www.google.ca/patents/US7797582?utm_source=gb-gplus-sharePatent US7797582 - Method and system for storing data using a continuous data protection system
