A system and method for efficiently backing up and restoring computer files to a central storage system. A hashing key is computed for each file to be backed up on a target computer. The hashing key is compared to a list of hashing keys stored locally to see if the local file has been previously backed...http://www.google.de/patents/US20080034021?utm_source=gb-gplus-sharePatent US20080034021 - Efficient Computer File Backup System and Method
