But... in at the very least two circumstances this feature is useful: backfilling much more bars following settings change (after you enlarge 'range of bars to load' in File->Database Configurations dialog It's important to power backfill for symbols that were backfilled previously with smaller range of bars) Reliable data feeds https://amibrokerdatafeed64296.ka-blogs.com/88402207/the-basic-principles-of-amibroker-data-feed