Shortly after the North East Power Failure in 2003, I installed a big generator to power my home. At that time, whole house generators were not popular and were very expensive. I bought a big a$$ generator online from Northern Tools and had an electrician wire it in to my house (transfer switch). entire cost including the outdoor enclosure was around 3k. At that time, the above type set up in the add was around 8 to 9k for the same size gas generator I installed.
I don't have natural gas at my home, and to bury a LP tank would not be cheap, so natural gas or LP was not an option for me.
With a full tank of gas in the generator, and a full tank with the porti containers with wheels (used for boats), I can get 2 days of constant use (3/4 load). In reality, I can get 3 days use because I would not be running 3/4 load all the time and would shut the generator down at night.
I don't store gas around the house, any sign of a storm I top the tank off in the generator and then get my porti tank filled up. After the storm, I just transfer the gas to one of my cars. Also, if I needed more gas, I could siphon gas from the one of many cars I have.
If you have natural gas I would go that route today, especially since the price of these generators are pretty cheap these days. The other advantage of the NG generators is, less maintenance, auto start in a power failure, auto exercising of the generator, and of course a constant supply of fuel.
This my setup
Transfer switch in the basement
Generator in outdoor enclosure
Generator
Enclosure