1. A method for automatic backup of digital data, kept in a memory in a computer installation, to a remote backup system accessible by the computer installation via a data transmission network, the method comprising: extracting and analysing operating information of the computer installation; determining settings of a backup application for backing up data to the backup system, depending on the result of the extracting and analysing of the operation information, analysing the digital data kept in the memory and classifying the analysed digital data into a plurality of classes of differing priorities; and executing the backup application on at least a part of the digital data, according to the determined settings and classes of priorities, wherein the method further includes detecting a creation in the memory or a modification of a digital element; in response to the detection, analysing the digital element in order to assign a priority coefficient to the digital element; and executing the backup application on the digital element, according to the settings and the priority coefficient which is assigned to the digital element.