Abstract: 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.

Abstract: A system, computer readable medium and a method for modifying a file, the method may include: determining, by a management server within a cloud computing environment, to modify the file; retrieving the file from a storage entity that is managed by a first storage service within the cloud computing environment; modifying the file, by the management server, to provide a modified file, wherein the modifying comprises flagging the modified file as to be handled by an agent that is hosted by a device of a user, wherein the agent is arranged to cooperate with a management server; and providing the modified file to at least one storage service.

Abstract: A system, computer readable medium and a method for encrypting a file, the method may include retrieving the file from a storage service; segmenting the file into multiple file segments; calculating a file segment signature for each of the multiple file segments to provide multiple file segment signatures; encrypting each of the multiple file segments to provide multiple encrypted file segments by using encryption keys that are in response to the multiple file segment signatures; wherein the multiple encrypted file segments form an encrypted file; and sending the multiple encrypted file segments to the storage service.

Abstract: A method for managing a virtual distributed file system includes maintaining by a master device located in a cloud computing environment, a metadata data structure that stores metadata about locations of most updated versions of multiple file portions and security levels of the file portions, at least one file portion being stored at a user device coupled to the cloud computing environment, and maintaining by the master device, transaction of file portions to user entities, at least one user entity being hosted by the user device, based on at least metadata stored in the metadata data structure about the file portions.

Abstract: A method for managing a virtual distributed file system, the method comprising: maintaining, by a master device located in a cloud computing environment, a metadata data structure that comprises metadata about locations of most updated versions of multiple file portions and of security levels of the file portions; wherein at least one file portion is stored at a user device that is coupled to the cloud computing environment; and managing, by the master device, transaction of file portions to user entities based on at least metadata stored in the metadata data structure about the file portions; wherein at least one user entity is hosted by the user device.