But... in not less than two instances this feature is helpful: backfilling extra bars following options transform (when you enlarge 'quantity of bars to load' in File->Database Options dialog You will need to drive backfill for symbols which were backfilled previously with smaller sized quantity of bars) The set up https://amibrokerdata20853.blogdigy.com/the-greatest-guide-to-data-feed-for-amibroker-52976622