Cloud Computing denotes the use of remote servers (usually accessible over the Internet) to process or store information. Access data using a web browser. Saving files online to a server is an example. The software itself can also be hosted by an outside party. The interest of Cloud Computing is twofold. It is a form of file backup. It allows working on the same document from several workstations (several people working on the same document or a mobile worker on the move) of various kinds (laptop or fixed computer, tablet or even Smartphone). Its disadvantage is the lack of control of the documentsâ€™ owner on the storage and even on their geographical location.