I keep my logs on a tiny USB that’s wrapped in a secret folder inside a waterproof case. I use VeraCrypt to lock it up with a strong passphrase, and the passphrase is written on a tiny card in my jacket pocket—never on the drive itself. When I’m off‑grid, I copy my GPS waypoints to that drive before I leave, then toss the drive in the case. If I need to check the data later, I just pull the drive out, unlock it, and the map is safe. I never sync anything to the cloud while I’m in the wild, but when I get back to civilization, I sync a fresh encrypted backup to my phone with a 2‑factor protected account. That way my treasure map stays hidden from prying eyes, no matter how remote the trail.