I read somewhere that these sites were intentionally positioned near population centers so that an attack on these nuclear facilities would also create a greater disaster.

Can you extinguish a protocol nobody owns?

Tape will work. But if you are opening up a laptop anyway, you might as well just do a physical disconnect and plan on relying on a webcam when needed.

I distrust the microphone more than I do the camera. They can gather a LOT more information using the microphone. When I got my computer, I opened it up and physically disconnected both the camera and microphone. Now, when I need to be on a video conference, I use a webcam to plug in to my USB. Otherwise, all that is off by physical impossibility.

IMO, Briar is the best option. I recently started a project to connect users in the Briar private groups and forums. We just need to get enough users active to get the network effect working for us and not against us.

So what is the best way to store things for the very long term?

Now that most of my friends and family are using it, I’m on Briar Messaging every day. Since there are no central servers, is entirely encrypted, and runs on the Tor network, I think it is probably the most secure messaging platform out there. It also has private groups and forums but I am not yet involved in any of those outside of a couple of small ones that are just for sharing family news.