A process for accessing a data storage device of a CCS through a GCS includes setting up a protected connection over the Internet between a first piece of terminal equipment of the user and the GCS by inputting the URL of the CCS into a program of the piece of terminal equipment, and using the modified DNS for name resolution of the URL, so that the protected connection is set up with the GCS instead of with the CCS; transferring a file over the protected connection from the terminal equipment to the GCS; setting up a session over the network between the GCS and the CCS; encrypting the file by the gateway computer system using the cryptographic key; transferring the encrypted file through the session from the GCS to the CCS; and storing the encrypted file in the data storage device of the CCS.