Know what you are keeping.

Inventory devices, exports and removable media before merging them; a missing source cannot be repaired by a tidy folder name.

Preserve the best available source and label derivatives; the biggest file or prettiest preview is not automatically the original.

Use a stable, shallow structure with an explicit place for unknown dates; do not reorganize every source at once.

Use meaningful names where they help retrieval, but preserve a mapping before renaming a large collection.

Treat a duplicate detector as a shortlist, not permission to remove the only high-quality or meaningfully edited version.

Separate the date of the event, the scan and the file export; preserve uncertain descriptions as uncertain.

Keep the scan source, corrected copy and descriptive note distinct; an attractive edit should not erase the available evidence.

Use labelled batches with a start and finish check; a running upload is not an accepted archive.

Keep a short ordinary document explaining structure, sources and uncertainty; do not make one gallery the only place the archive makes sense.