I don't suppose there'd be any interest in making it possible to store media in a blob table in the database?
That requires some tuning to retain good performance (mostly related to the in-memory cache size), but it'd make backing up a lot easier and partial/incomplete files from crashes and other annoyances would be gone. SQLite (https://sqlite.org/c3ref/blob_open.html) can do incremental IO in blobs (so can others) and Python (https://docs.python.org/3/library/sqlite3.html#sqlite3.Connection.blobopen) actively supports it.