Short answer
Journal → Export downloads everything as JSON. Settings → Danger zone erases all local data permanently. Both act on data stored in this browser.
Detail
- Analyses, decisions and settings are stored locally on your device rather than on a server. This is why a shared analysis link only opens in the browser that produced it.
- Export is unconditional and unthrottled — it is your trading record, and a product that made it hard to take with you would not deserve it.
- Erasing is immediate and cannot be undone. Export first.