An apparatus and method to replicate one or more files between non-symmetric storage systems are disclosed. The method supplies a first storage system comprising a first configuration, a first volume, a first file system, and a first replication appliance comprising first replication appliance memory....http://www.google.de/patents/US7640279?utm_source=gb-gplus-sharePatent US7640279 - Apparatus and method for file-level replication between two or more non-symmetric storage sites
