The concept of "layering" is applied in many fields. For example, "layered clothing" means wearing multiple layers of clothes, so that when cold, all of them work together to keep you warm, but as things warm up, you can take off one layer at a time to stay comfortable. It's less useful to have just one warm garment, which may leave you too hot (with it on) or too cold (with it off).
I apply the same technique to planning for emergencies. Say you want to prepare for a weather emergency such as a hurricane or tornado that takes out power, water, etc. to your area. Ideally, you'll have a selection of preps that can be used depending on the conditions at the time. For example, when it comes to food, having some that can be eaten without cooking or heating is a good idea for the first day or two, in case those facilities aren't available. Longer term, have multiple means of cooking (e.g. electricity, propane, firewood, charcoal, etc.) so that if one isn't available or usable, another will be. (See my earlier article about rocket stoves; we have a couple of them standing by, plus fuel for them.)
I've just taken delivery of our wood supply for the winter; about a cord of good hardwood (oak, pecan, etc.). Some can go in our fireplace as is, for regular fires during winter, because we like them; but there's enough extra that if power went out for a week or two, we'd have enough to keep the living-room warm 24/7 (and the cats sprawled out in front of the fireplace!). However, we're not limited to firewood. We have a kerosene heater, with enough fuel for a week or two; three small propane heaters that can warm bedrooms; and a cylinder-top propane heater for bigger rooms. We should get by for the likely duration of an emergency. If it turns into something long-term, well, we'll have to figure that out as we go along - but then, so will everybody else.
As far as electricity goes, having a standby generator has long been good practice, as well as battery-powered backup lights, radios, etc. More recently, electric backup "power stations" (such as those from Bluetti, Ecoflow or Jackery, to name only a few well-known brands), have come on the market, challenging the supremacy of generators, and are making inroads. I like the idea very much, particularly because they can be recharged using solar panels, but their prices are still pretty high compared to a generator's power output (especially when factoring in the solar panel cost in addition to the basic power station). I'd love to find a portable solar panel setup that can be used to charge any "power station" or battery bank or something similar, regardless of manufacturer, but so far I haven't found anything affordable. Can any reader suggest a good solution to that need? If so, please let us know in Comments. I'm sure there'll be lots of interested people.
So, dear readers, how are you layering your defenses, and your preparations for emergencies? Share your ideas with us in Comments, and let's learn from each other. The way things are going, we're likely to need them.