But... in at the very least two scenarios this option is beneficial: backfilling extra bars right after configurations change (once you enlarge 'range of bars to load' in File->Database Settings dialog You will need to drive backfill for symbols that were backfilled Formerly with scaled-down number of bars) Dependable data https://finnvvtsr.webbuzzfeed.com/35659337/the-5-second-trick-for-amibroker-data-feed