A method and system for reducing storage requirements and speeding up storage operations by reducing the storage of redundant data includes receiving a request that identifies one or more data objects to which to apply a storage operation. For each data object, the storage system determines if the data...http://www.google.com.hk/patents/US7840537?utm_source=gb-gplus-share專利 US7840537 - System and method for storing redundant information
