Your existing experiments will remain on your device as long as Google's Science Journal app is installed on your device. Furthermore, as long as Google's Science Journal app is installed on your device, you can continue to conduct experiments and export and import data, though your data will no longer sync with Google Drive. However, after December 11, 2020, if you uninstall Google's Science Journal app from your device, your experiments will be deleted and there will be no way to reinstall the app.