Do you have a wood burning back up? At my house in Massachusetts, we had a wood-burning stove that we could always fire up in a pinch. It never came to that, but it felt good knowing that we can always just burn a super hot fire and not freeze to death.
I live in an urban environment, so I'm not too worried about losing power for an extended period of time, and if I do I would probably just leave temporarily.
In my rural living fantasy I have a Ford F150 Lightning which I use as a "portable" backup battery that can be recharged by driving it to a Level 3 charging station. That and either a pellet stove and/or a Masonry Heater fireplace that sits opposite to a large equator (south) facing window.