Lazy AI does not backup data from your testing apps. In some cases, Lazy AI may be able to help recover data loss from a production app. Please reach out to the support team if this occurs with your production app so the team can try and help.
Testing apps have a seperate database from Production apps. That means when you publish an app to production, the data is not migrated over from test to the production app, the production app will start with its own database. However, you can manually export / save data from your test or production databases anytime - see this help article: "How to Export/backup your app files and data"