2. Encrypt and upload it to internet.
3. Erase the original card.
4. Write this to the original card:
Track1:
%B6666666666666666^MYSTERY/MINER^13106666666666666666?
;6666666666666666=13106666666666666666?
6. Get to destination, download the original and write ir back to card.
Additional steps require making sector by sector image of the harddrive and uploading it to internet too. Encrypting and taking and writing down the checksums of the image is good idea also. Then use DBAN to erase the harddrive. You cross border with blank harddrive.
Damn fine advice.