Upload & Sell: Off
I know I wasn't asked but may I offer an alternative thought.
Go with a redundancy more closely related to the the odds of failure or of somewhat less than 100% coverage.
I'd guess that what you save might could go a fair way to funding another trip, (which you seem able to do), and you will have the fruits of experience to enjoy what you feel you missed the first time. Consider a return as your redundancy.
Money I got; time, maybe not so much: I'm 64 with a rare blood cancer so while I might be around for many subsequent trips, I might not. So I want to maximize the chance of this one working and I'm a big believer in "failing to plan is planning to fail". BTW the Wall Street Journal did a great article on me about my illness called The Longevity Puzzle, by Liam Pleven, October 10, 2014. It's got a good picture of me, too. They sent a photog out to my house twice, because the WSJ photo editor didn't like the first ones he got. He shot with a Leica M digital rangefinder. (...this is a photography forum, so I just had to mention that )
Think of this like a pro: if you're shooting for a client you wouldn't say, 'that's OK we can do it again some other time'. Seriously, you can't re-do a wedding, a football game, an inauguration, a commencement speech, etc. If you're a pro you make SURE you can get the job done. Well, now I'm my own client, so why should I treat this client any worse?
(having written that I just realised I undermined my own premise by citing an example above where a pro DID re-do a shoot. )
Regarding "the odds of failure", no one in this discussion, including me has a enough data to compute that, but in my time shooting in the field I've had 3 spontaneous equipment failures (all Nikon lenses), and I also once accidentally knocked a tripod-mounted SLR with Nikon 180mm f/2.8 to the ground. The lens survived (and I still use it today) but the FM2 body was totalled. I also once left an FM2 on the roof of a car as we drove off, so my carelessness cost me 2 SLRs (I owned four FM2's, altogether - best workhorse camera ever made - always traveled with two), but if you're jet lagged and tired you're going to get careless, so you better have a spare. I also once had the cast aluminum top where the legs attach of Bogen Manfrotto 3051 just spontaneously fracture in the field.
All these failures have happened in the field; I've done lots of studio work with models and never had a lens or body fail there, so maybe having a pretty model present is the secret to reliability, although I did once have a model accidentally knock over a monolight - she wasn't hurt but the light was destroyed. Natch, I had a spare, so the shoot went on. That should be every photographer's motto: "the shoot must go on!"