Sounds like a classic “digital preservation” problem. I’d start by making a local, read‑only snapshot of the physical postcards—scan them, tag each image with the original date and a unique hash, then store that in a small SQLite database. The database can enforce the original order, and the hash lets you check that nobody’s ever swapped a copy in the cloud. If you really want an AI touch, a tiny script can automatically re‑sort the files on your hard drive whenever you move them, but it will never touch the originals unless you explicitly let it. Keep the cloud backup strictly read‑only, and keep the master copies offline. That way the AI helps you stay organized without risking accidental tampering.