Mark12
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Mark12's post in Docker image file filling up but containersize says there is plenty of space was marked as the answerOk, for anyone who's wondering: it wasn't the mappings. I deleted ALL my docker volumes using docker system prune. After downloading only the Nextcloud AIO image I got a message stating docker.img was ful.
After some more research I found that the btrfs subvolumes are not cleaned up under ls /var/lib/docker/btrfs/subvolumes the command "ls /var/lib/docker/btrfs/subvolumes | xargs btrfs subvolume delete" fixed it for me!