But... in at the least two situations this option is useful: backfilling extra bars immediately after options alter (after you enlarge 'amount of bars to load' in File->Database Options dialog you have to drive backfill for symbols that were backfilled previously with lesser variety of bars) Choosing the right amibroker https://connerdfeda.tkzblog.com/34946503/5-essential-elements-for-amibroker-data-feed