I think your jerky will depend upon how much fat is left on your meat when you dry it. I am sure the leaner it is the longer it will last.

Your senarios seem oriented around "bugging in", my plan too (at least my main focus). I plan on burying a 1200 gallon cistern and rotating it every 4-6 months. This would allow for many months supply with our family of five. We are on a well, but have a historic shallow well on the acreage that I may run a gravity feed to the cistern with some 1" pipe (500' and about 20' drop). Also, I REALLY like the aluminum Army medical containers for hermetic and vermin-proofness (food or gear). Look at Coleman Supply, under containers. I bought a batch of 50 or so from GovtLiquidation, at about $30 each. They come up on occasion there and I bought my first (20) about 20 years ago from a surplus guy for $20 each. I keep an impressive amount of high end outdoor gear in them in a shed outside and have never had anything damaged by vermin. they are a standard around my property/operation

Ironwood