1. A method for automatic backup of digital data, kept in memory ( 26 , 28 ) in a computer installation ( 12 , 14 ), to a remote backup system ( 16 ) accessible by the computer installation ( 12 , 14 ) via a data transmission network ( 18 ), characterised in that it comprises the steps consisting in: extracting and analysing ( 202 ) operating information of the computer installation and determining ( 204 ) the settings of an application ( 34 ) for backing up data to the backup system ( 16 ), depending on the result of this analysis, analysing ( 206 ) the digital data kept in memory ( 26 , 28 ) and classifying ( 208 ) the analysed digital data into a plurality of classes of differing priorities, executing ( 210 ) the backup application ( 34 ) on at least a part of the digital data, according to the determined settings and classes of priorities.