“There is no backup that would survive a EMP anymore than a hamm radio”
An old tube ham radio, say a Hallicrafters, will survive an EMP burst of frightening intensity. It’s the solid-state wonders that fry. Tubes are quite hard, if a bit power hungry due to the filaments.
Hard to melt vacuum, yano. Silicon melts much better.
My ham gear is in a copper room. It’s after the EMP that I remove it and power it up, and yes its all battery operated.
KJ4AQM