But... in not less than two scenarios this feature is useful: backfilling extra bars immediately after options alter (when you enlarge 'amount of bars to load' in File->Database Options dialog You need to drive backfill for symbols which were backfilled previously with lesser amount of bars) The set up wizard https://amibrokerdatafeed86318.jaiblogs.com/62164978/amibroker-data-an-overview