In the case of some war involving EMP, many smaller electronics should survive. Even so, if you're worried about that, you should stock up on things like food, medical supplies, and beer. That's what what people will want when the lights go out.
You should be doing that anyway, if you have the funds to risk in investments, you should be trying to limit your risks of personal loss in the unlikely event of a social crisis before placing any funds at risk for a retirement. Even the bible talks about this in many places. It's so central to the Mormans' religious interpretation that households are obligated to stock up for a year for their entire family, so as not to be a burden upon the community in the event of social collapse. Morman churches usually have a collective food pantry controlled by the head of the local church (bishop?) to cover this obligation concerning the missionaries (mostly young men in college) who are no longer a part of their parents' household and not yet at the point in life to establish their own household.
Mormans take the passage, "A fool spends all that he has, but the storehouses of the wise are filled with choice food and oil" very seriously. Considering that they are the only denomination to have experienced a real war with the US Government at any point in history, they might have something to contribute to plans for a future that that same government goes mad.