If you need to rely on any petrol generator your waisting time and money. Sure, it's nice to have a small unit in hope you dont need to use it. One cant take for granted that fuel will be available or affordable.Oh, I get it.
It seems that you didn’t get my response.
First, preparing for times ahead is so simple a caveman could do it.
Second, you need to prepare to live as a caveman, primitively.
You're concerned about cyber attacks, yet you are preparing by having your your fridges on GFI's? How's that supposed to work?
If I misunderstood what you meant by GDFI's, please explain.
Solar, with battery backup, or a diesel/gas generator, and a means of severing from the grid, is the prominent way to keep the fridges running when the grid goes down.
SOLAR, is really the best alternative. For most dwellings. Most don't realize the refrigerator is the easiest hurdle to jump. There are multiple units available that work off of LP gas alone no electricity also Kerosene. Units are referred to as absorption diffusion refrigerator.
They are extremely efficient and cool and freeze like a normal fridge. I don't know how the get the light to work inside, but it does. This technology is 90 years old.