Bind mounts. Always use bind mounts for data you care about, otherwise the “managed by docker” volumes are fated to be forgotten.
It won’t be your file structure as the file tree is managed by paperless, but at least using bind mounts you can easily navigate files and back them up independently or docker and paperless.
yes, a bind mount / bind volume is when a volume is explicitly mapped to a location in your local storage rather than managed by docker and likely owned by root.
https://docs.docker.com/compose/compose-file/compose-file-v3/#volumes