On my iPad, the sum of my world's data sizes in the Minecraft app is 5.4 GB (2.6 GB, 2.5 GB, and 300 MB). The Minecraft app container's data has an iCloud Backup footprint of 32 GB as reported in the Settings app. I would expect the iCloud backup size to be similar to the total of the world sizes; a 6x multiple makes it seem like the app must have orphaned some files inside the container. I don't want to lose my worlds, yet this is causing me to run out of iCloud storage so I'm not able to run an iCloud backup at all (unless I exclude Minecraft from backups).

My preferred solution is obviously for Minecraft not to do this in the first place, but as a backup measure to scan for and remove stray files during initialization; essentially the on-disk moral equivalent of garbage collection.