US Patent 8977661 System, method and computer readable medium for file management

A method for file management, the method may include: calculating, by a management server that is located within a cloud computing environment, signatures of multiple files that are stored at multiple storage entities; and finding, by the management server, groups of similar files out of the multiple files, wherein the finding is in response to similarities between signatures of the multiple files; wherein the multiple storage entities comprise at least a first storage entity that is managed by a first management entity and a second storage entity that is managed by a second management entity that differs from the first management entity.