I'm slowing getting away from most canned veggies except corn...they all taste like crap with little nutrition...
another thing good for barter, if sadly we find ourselves in that situation, is wax paper, plastic wrap, matches, and aluminum "tin" foil....that stuff last forever....
I have an old house I use for storage and decided that even with the power off, I would store some items there. Heat is your number one killer of items IMHO. I had an old freezer there and stuffed it with food items (including olives) and two years later (rotating them out) I found the olives had obtained the taste of the moth balls I had also stored in the freezer. That tells me that they breath somewhat when heated. Anyhoo, I had to throw out a bunch of items because of my blunder.
Keeping food cool/dry/bug free with no power would be a thread that would interest me.
They do have some liquid which helps with the water requirement, and they have some nutrition, though not as much as fresh or frozen. And they don't require electricity to be good.
We bought a new freezer, and it went on the fritz a couple of times, and the repairman couldn't find anything wrong with it. So eventually the warranty ran out, and we just got tired of messing with it and unplugged it.
We are also canning and dehydrating some of our own foods.