...and I'm struggling to find a well reviewed heat pump unit that isn't $5000. That and the previous unit was installed in 2017.
What's wrong with the Rheem units and such? $1400 or so last I looked, and you can get both a federal tax credit and potentially power company credits for it. In my area, they can be had after credits for around $700, if you do the install yourself. Downside is that you may need more venting, and they're not silent. I'll need to vent our water heater closet door (fun with a saw, I suppose), and probably schedule the thing to only run during the day, because they're noisier than the combustion or resistive type. That works better with our solar production curves as well, though - no point in reheating morning shower use water with grid power only for solar to kick in hard an hour later. Of course, that probably means the stupid thing needs an internet connection, which I've no interest in granting random appliances.
As for backup power, a generator and manual transfer switch is the right option. I tried, very hard, to make integrated battery and backup make sense for my home solar, and even ignoring the fact that the plans review person doesn't like batteries so won't approve them (even for people who do solar for a living), it would have been exceedingly expensive for what capability I gained.
I would look into EV inverter kits that would allow you to heat your house from your car's battery in case of a power outage. Something like this: https://evextend.com/
Careful. I really don't like that idea unless you've got a PHEV and onsite fuel storage. First, most of those inverters are only 120V/1500W or so - the DC-DC converter in most EVs won't let you pull more off the 12V system, so you're limited to single phase loads, which will run a fridge or freezer, but probably won't turn a furnace blower (they're typically 240V), and definitely won't heat the house meaningfully.
You also then have the problem of running your EV battery out, and if it's an EV, not a PHEV... then you have a problem if the power remains out. You can do some cross tie, but a PHEV is a far better option for that sort of use. Rather off topic for this thread, though.
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As far as not burning stuff by 2030, though, I'm certainly not going to get there. Too many things that run infrequently but are critical for property maintenance run on gas and aren't easily converted to anything else (80 year old tractor), and the frequency of use of a lot of the liquid fuel vehicles just doesn't justify the costs and emissions of replacing them with an electric that won't be used much. Replacing 15 gallons a year of tractor gas with electric just isn't reasonable at any level, and the same goes for a variety of other things used around the property. I'll run bio blends for diesel if I can find it in the truck, though that's hard to come by out here, sadly. But to replace a "1500 mile/yr" truck with an electric at the cost of our house just doesn't make any sense for that use case. I'm aiming for net negative emissions with solar overproduction and such, but liquid fuels are just too useful to eliminate them for no good reason.
Also, I can't heat my office during an inversion without at least a bit of propane, kerosene, or candles. I use all of the above depending on demand in there. I go through a couple gallons of propane a year for winter heat.