I'm fortunate, in that I never have to buy, or even cut down trees for firewood.
Like the OP, we use our fireplace mostly for aesthetics, but it nice to have when the power goes off and we need to keep warm.
I have about 16 acres of mostly hardwoods (red & white oak, primarily), as well as some pine, poplar, and sweetgum.
IMO, you need a cord of wood stored in a dry area, to what you want to do.
In 2023, we had a windstorm that blew down several of our big oaks.
A friend and I cut and split 2 large red oaks (we share a wood splitter).
If you get to it pretty quickly, split interior wood without bark. I has no insects and can be kept inside for a long time with no problem. (I have some stored in my basement, garage, and front porch).
If conditions are dry, I use what's stored outside first, then always work from worst until first as I need firewood.
I live in a "low priority" area when it comes to electrical restoration.
I don't consider myself a "prepper," but being where I live for 23 years has taught me to have several sources for backup heat.
1 - Normal HVAC (heat pumps first, then emergency LP gas)
2 - LP gas (plumbed) - I only have one non-vented space heater in my basement, w/o a pilot light (might as well have basement full of black mambas!)
3 - Wood fireplace
4 - LP gas portable heaters (bottles)
5 - Kerosine space heaters
6 - Electric space heaters powered by gasoline generators (very wasteful, but, sometimes, you do what you have to do)
7 - Cold weather camping gear
I also have a camper parked outside, so I'm good for a few days with a charged 12V battery and two- 20 pound propane cylinders. (It will have been "winterized" at this point, so I won't have water).