Just tried loading an old backup on a realm from like 2019, (we had multiple saved worlds on there). I loaded up the wrong one so i tried a different backup except NO all the backups were deleted if you loaded up one of them. @MojangSupport

Great to keep in mind that Realm Worlds delete themselves after about 280 days and if you haven't touched it since 2019 it's gone. From the FAQ "Once your subscription has been inactive for more than 18 months, your world will be permanently deleted from Minecraft's servers."^TK

then why did it let me back up the world