Abstract: This disclosure describes a process for storing data on a central server with a plurality of users, each of them having their own user password used for creating a user key, being respectively assigned to some of these users, and some of the data, being divided into data blocks to be uploaded, and each data block being compared to data blocks on the server based on a unique data block ID value in order to determine whether a corresponding data block is already stored on the server and to upload to the server those data blocks which are not already present, a data block list to be uploaded being created and uploaded to the central server, so that in a data recovery step data stored on the central server which are requested by the user can be restored in their original form based on said list.

Abstract: This disclosure describes a process for storing data on a central server with a plurality of users, each of them having their own user password used for creating a user key, being respectively assigned to some of these users, and some of the data, being divided into data blocks to be uploaded, and each data block being compared to data blocks on the server based on a unique data block ID value in order to determine whether a corresponding data block is already stored on the server and to upload to the server those data blocks which are not already present, a data block list to be uploaded being created and uploaded to the central server, so that in a data recovery step data stored on the central server which are requested by the user can be restored in their original form based on said list.