Incremental backup should use timestamps of altered files
It seems that Incremental backup does not use the file-timestamps for establishing files to be backedup. This causes an unnecessary long time to backup while the whole disk is being read for changed datablocks. The need for incremental is not only a smaller backup-file but also a very substantial shorter time. As the current way of making incrementals takes almost as much time as making a full backup, one could just as well make a full backup every time, reducing time for merging incrementals during restore.