In regard to EMP threat; Use faraday protection for valuable electronics/data. Poor man's faraday cage: cardboard box with lid. Wrap item in layers of walmart plastic bag or other type of plastic bag. Completely wrap box in aluminum foil. Concept is that of insulating object and giving current path of least resistance around object. I've also heard microwaves can be used as a faraday cage. I dont own a microwave so I'd recommend more research before relying on one.