A while ago I started keeping a digital offline diary. Digital in the sense that it lives on a computer, but not published on the web. As a result, far fewer brain farts end up here on the blog. And that's a good thing.
Content-wise, it's mostly facts about the day, plus conversations or events I'll want or need to remember later. Nothing too private.
I write the entries in Markdown with a kind of front matter. Every day I create a file, e.g. 2026-07-18.md, and write into it in a more or less unstructured way. Zettlr has proved to be the ultimate writing tool and even has a LanguageTool API integration.
Plain text, which is what Markdown ultimately is, strikes me as a future-proof format for storing writing in the long term. Anyone who has been blogging for a decade or two may well have wondered whether keeping a blog solely in a database is all that future-proof.
So that I can write from any device, the texts live in a private Git repository. And to read the whole lot in comfort, there's also a small Git/PHP project that renders the diary in the browser.