The easiest way to get that is to lose the DB, which then thinks there should be no remote files.
You can see if the destination has 15774. If so, that’s probably it. This can happen if one deletes
the DB on purpose to try to get a fresh start (solution is also deleting the backup files manually).
In your case, the disappearing DB issues might have caused a new DB to see the old backup…
EDIT:
If the goal is to recreate the DB from backup (to avoid backup uploads), use Database Recreate.
Generally this should be pretty fast, but if information is missing it can wind up in a big download.