But... in at least two situations this option is beneficial: backfilling more bars soon after configurations modify (after you enlarge 'quantity of bars to load' in File->Database Options dialog you have to power backfill for symbols which were backfilled previously with more compact range of bars) The data feed is https://amibroker-data-feed99753.answerblogs.com/35374880/an-unbiased-view-of-amibroker-data-feed