I think the main problem here was that there wasn't a single script that:

1. Accepts no parameters.

2. Looks for an SD card with a bunch of Sony-structured folders.

3. Copies the media from that to the NAS folder directly and fsyncs.

4. Checks that the files are there and look ok.

5. Maybe triggers a ZFS snapshot? Why not.

6. Only then deletes the files from the source.