The assistant is optional: you can write, keep notes and export without it. Calls go straight from this browser to the provider; keys stay in this browser.
Describe how you write, as a few bullet points. It's used when the assistant suggests clearer wordings, so the options sound like you. Or use "Learn from my writing" below.
Paste two or three things you've written. The model drafts a guide from them; the samples aren't stored.
Versions are also saved automatically when you open a post, before you delete a big chunk, every 20 minutes of writing, and before any restore.