Metronaut automatically records your performance (between the moment you tap the play button until you tap pause). All recordings are stored on your device and are considered temporary unless you decide to keep them.
You can find your recordings by tapping the Recordings button from the ⚙️ menu in any Practice screen.
Temporary recordings are automatically cleaned everytime you launch Metronaut and recordings older than 21 days are deleted to free up space. You can also control storage yourself.