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.

Slashdot has a comparison of a few alternatives. My preference is Briar as my user name would indicate!

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.

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.

There are sites like Ahmia that you can submit your site to and which attempts to do indexing. People who run .onion sites should also do webrings like what were popular in the mid-1990's. I remember seeing those all the time on the original Geocities. Starting a .onion site is easy to do with software like OnionShare.