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As far as being "for when we didn't have freezers and you needed safely-preserved food through the winter" -- who's to say those days won't come back?
It feels good being able to grow and preserve a little bit of my own food, because it makes me feel like if I have some skills that might be useful in case of some disaster where the supermarkets and the freezers for some reason became useless.
It's not that I'm some Peak Oiler or anything, but there's no harm in learning how to survive without supermarkets and freezers.
So I learn some cool skills, and get some fantastic Meyer lemon marmalade that can't be bought in any store, at any price.