I've started work on an export feature for Pagecord so people can take their content elsewhere if they want. The plan is to create a ZIP file containing HTML files for each post, plus local images. Each file will have the same name as the URL (e.g. this-is-my-post-34c232.html or 34c6b013.html for posts without a title). I might add an index file in there too. And maybe an option to export in Markdown rather than HTML (Pagecord stores content as HTML so that's easier).
No CSS will be included, just plain old HTML, but I think that's ok.