Git
What is Git?
The version-control system — the same one that safeguards most of the world's software — running invisibly behind knowdust's version history.
Why it matters
It's why "kept forever" is an engineering fact rather than a slogan, and why export gives you real files instead of a proprietary format.
How it works
Every note is a plain markdown file; each version is a Git commit on knowdust's servers. You never see Git directly.