You could mirror your blog posts to a decentralized network like Secure Scuttlebutt, assuming you have a few friends who would be willing and able to follow you

You could mirror your blog posts to a decentralized network like Secure Scuttlebutt, assuming you have a few friends who would be willing and able to follow your feed and thus mirror your content. Or it might be simpler to just email out a copy of each blog post to a little mailing list of people who care about you. Let them know that you'd like your legacy to remain public and they can probably coordinate among themselves to set up a public archive when the time comes.