Gee, my mom isn’t a prepper, but she still has the 19th century Wheeler and Wilson that she sewed stuff on when I was a kid. It got to the point where she would make her own cables when they wore out.
My wife uses a Pffaf, guess when the power goes, we’ll have to just make do with needle and thread.
Mine can be run by hand when the power goes out. Not super-fast, but certainly better than needle and thread by candlelight.