Sharing between offline computers

We create content all day. We take pictures, write comments on articles, or even the articles themselves. We save bookmarks, or press some like or heart buttons. Even if this content is of no value to anyone else, at least it is to ourselves. Still, we trust other parties, commercial ones, with servers often in other countries, to give us back our content any time of the day with the click of a button. Even if they want to, they may not always be able to do so. In my previous post I wrote that we put too much trust in the internet.

Would it not be nice if all this content was on our own computer hardware, that we could easily categorize and search it, and share copies with our friends? I would like to share some ideas that I have to make this technically possible, so this is going to be a technical article for that reason.