But... in at the very least two cases this feature is useful: backfilling far more bars following options change (if you enlarge 'number of bars to load' in File->Database Options dialog You should force backfill for symbols which were backfilled Beforehand with smaller sized amount of bars) The data feed https://amibroker-data-feed76419.blogpayz.com/35270522/what-does-data-feed-for-amibroker-mean