Good post mannyrock! the only thing you need to know about goats, as was told to me when i was investigating raising some is that from the time they are born they try everyday to find ways to commit suicide!
My grandmother had a big crock with lid in her utility room (not airconditioned) that she kept salt pork in year round it was never bad! the reason i know is i always went thru and pinched off a piece at the risk of a wood spoon upside my head!
Our goats are very little maintenance... They are able to convert a variety of grasses , Browse (twigs, Bark and such) pine needles and leaves with very little low nutritious substances into sustainable food sources. Also as small ruminants they will not eat a pasture bare.
preferring browse over pasture. They are small, compact and can provide meat , milk, Butter, soap , yogurt, and fiber for clothing.
Our chickens provide us daily supply of eggs .. and left to free range do quite well eating small bugs, grass hoppers , etc as a food source without supplementing with corn or feed. (,Ducks, and Geese, are also pretty easy to maintain. Goose eggs and Ducks eggs taste great pickled as well.) None of these guys require refrigeration as long as they are running around and can be eaten quickly after they are cooked. Goose and Duck Feathers can also be used as a by product when the time comes. I would assume Turkey' s (though I have none on the farm as of yet) would also be easy to maintain.
Our potbelly pigs also do quite well free ranging on grasses leaves Hay ,(wifes flower garden which she is not too keen on ) etc.. We do supplement their diets with feed (but that is by choice). The small pot bellies are nice because they require minimal space to maintain.
They are a great clean up crew able to eat what others will not.
I think the difficulty would be for most livestock is sustaining them through the long winter months without hay and supplementing with grains and oats and such when grasses are long gone .
Side Note: Goat waste can actually be compacted into small brick molds and left alone to dry for a few weeks can be burned just like firewood (no smell after it's dried). Makes a great alternative fuel source that can be burned in a wood stove with no creosote to worry about. Horse waste can accomplish the same alternative fuel source.
You don't need a freezer to store meat, fish etc in warmer months.. In colder months Nature provides the refrigeration
You can make meat soups and can it.
you can salt it down and store it in a Hole dug (root Cellar) into the earth lined with moss.
you can make jerky
you can smoke it.
The Koreans thinly fillet and air dry their fish and serve it with beer like we do with peanuts or pretzels
you can also pickle a lot of food and it stores quite well without refrigeration or spoilage for a long time.
Beans are also a high protein source that last a long time as well.
Potatoes (as well as other root vegetables parsnips, carrots, etc..are a good crop to grow as well ..zero maintenance.. make through a winter underground.
Mannyrock's suggestion of a spring house is a great one if there is a viable water source.
Also you could create a green house and extend your fresh vegetable growing for quite a while.