Undo anything with Versions
Baumeister saves a snapshot of your project automatically every time the AI changes it, and keeps the last 20.
To go back: open the project and click Restore on any earlier version. Your current version is saved first, so restoring is never a one-way door. If you restore and change your mind, restore again.
This is also why it's safe to experiment: try the bold idea, and go back if it doesn't work.