If you break the device or uninstall the app, you will lose all your data.
There are 2 ways to protect them:
• Become a subscriber. You can buy a subscription in the Store page within the app. (Paid option)
You can find more info in the "How subscriptions works
• Enable the automatic backups in Dropbox. You can do it in the Settings page, backup section. (Free option)
You can find more info in the "Backup and automatic backups