FWIW, what ever you decide, an old photo Journo friend of mine says, "just carry a hat full of cards and do not format until they are safely on at least 2 external drives on return"
A lot of old-timers had a similar modus operandii with photographic film.
Take your photos and send the exposed film to the mail-in processing lab in batches. (Back then, it might have been prepaid envelopes.) If you shot twelve rolls of film, the first group would be rolls 1, 3, 5; the second group would be 2, 4 6; the third group would be 7, 9, 11, etc.
This way, if the lab or USPS screws up, you still haven't lost everything.
If you are completely paranoid, take a photo of your piece of paper with your contact info as the first photo on each card. Again, back in the old film days, that was also the OCD photographer's trick, just in case the lab lost the paperwork. OCD photogs also applied contact info stickers on the film roll (which served a secondary practical purpose in indicating that the roll was exposed).
Never ever put exposed rolls of film or digital cards with images in checked luggage. Heck, even the airlines admonish flyers not to put valuables in checked luggage. Photography gear? Insurance will pick that up. Photos of your memories and events? Those are priceless, that's what you haul with you.
A lot of MacRumors participants are fixated on gear, but it's not really the important stuff. The truly important stuff is your data.