EMP and solar flares are the big lurking possibilities. The last large solar flare we had was in the 1800's and it was strong enough to melt the telegraph wires. Now, the telegraph was really simple. For it to damage the telegraph system like it did, we are going to be in big trouble because NASA said the next one will be worse than that one. Electricity will be gone for a while. There are so many small electronics involved in the transfer of our modern electricity. Almost every vehicle made after 1987 will be fried. I advise everyone to have an older type vehicle for a BOV because of this. Satellites will be fried, so there goes gps and cell phones and whatever else they control. There is a reason NASA has shut down, they know what is coming. Sources tell me that a large flare will shut things down so bad that it will be three years before everything gets back up and running, and that is a government estimate, and we all know how their estimating is. I hope people can imagine how society will come apart. Electronic banking, welfare checks, food stamps, social security, all depend heavily on electronics nowadays. Remember Katrina? Most of those people didn't evacuate because checks came on Monday.
So, if you have electronic things that you want to salvage, you should make a faraday box. This can be any metal box, a large tool box from the back of a pickup is an affordable unit. The electronics cannot touch the sides or the bottom of the box. This means you should insulate your things from touching the box. I would say, you could line the box with rubber, like some of that rubber matting found at feed stores, or maybe plywood, just something that does not conduct electricity and will prevent metal to metal contact. A lot of electronics are already designed this way, as far as government and critical controls. But, not all are. My brother works for the phone company, and I see what high voltage on small wires turns out like. If there are still some things you don't understand, ask me questions.