Technology

Since the EMP effect is known, this is what will happen in the event of a nuclear war. The attacking country is not going to drop a nuclear bomb directly on a city in Hiroshima-style, because it is not in the interest of leaving a destroyed and polluted country that it wants to conquer, but of disabling its infrastructure.

Of course, you can protect some electronic devices, putting them under a Faraday cage, in case of an EMP because of a nuclear bomb that explodes at high altitude, but this is not possible in large facilities, such as power plants, vehicles, water pumping stations, gas station fuel pumps, server stations, etc.. Without this, the cibilization collapses completely, without water, without transport, without food and without communication.

Short- and medium-range nuclear missiles are more frightening, since they are what is going to be used, because they do not give time for a possible defense that would give long-range missiles, since short-range ones only leave 2-3 minutes of margin, before reaching the target or the stratosphere above a country, putting off its lights.

I can answer your electronics worry, but not the nuclear one. A small Faraday cage would work to protect your devices.

Does anyone have recommendations for reasonable faraday cage enabled containers? For a laptop, HDD and such.

There is a subreddit you might find interesting r/prepperfileshare

Beyond that, you could always just vacuum seal multiple low power SOC computers with portable solar panels, couple of USB hard drives, Blu-ray drives with archival blu-ray discs and then just bury it in an appropriate container. Adequate depth in the dirt can make an effective faraday cage. Store an archive of wikipedia and other useful information. I probably wouldn't bury any lithium batteries with the solar because they would likely be useless without receiving a charge underground for so long.

Work on getting prepared now so you're used to living that type of lifestyle before the bombs drop. It makes you more likely to survive unexpected circumstances while you still have civilization around to fall back upon while you're working out all of the unforeseen kinks. Ask me an questions you might have if you have questions.

Also the other advice in this thread is good too: prepare for the most likely disasters, and focus on strengthening your local community to local disasters.

You could absolutely build a Faraday cage, but if you're thinking about disaster prep then I would not put that high on your list. Find out what disasters would be most likely in your area and get prepared for those. If possible, get involved in local programs to help out in the event of an emergency. I'm just getting involved in a program called CERT that is associated with FEMA in concert with local governments.

Community members get training to supplement first responders in the event of an emergency. In my area, the Big One is a subduction zone earthquake, where we would likely be involved in the city's response. There is also some involvement in more pedestrian emergencies like weather events.