Metronaut automatically records your performance in Audio (between the moment you tap the play button until you tap pause). Starting version 6.2.0, you can also explicitly do a Video Recording of your performance.
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 Tools menu in any Practice screen, or from the My Music screen.
Temporary recordings are automatically cleaned everytime you launch Metronaut and recordings older than 30 days are deleted to free up space.
You can also control storage from the Account Tab.