If you're seeing a yellow banner at the top of your app's menu / data screen inviting you to register for / log into an account to keep your data safe, this is because you're not currently registered for / logged into an account in the app.
Unlike many other menstrual cycle apps, the account login is an optional feature of Read Your Body not automatically connected with your subscription. (It's entirely possible to use the app without an account - in this case all data is stored only on your phone.)
If you're seeing this yellow banner prompt, we'd warmly encourage you to register for / log into an account inside the app at Menu > Account. All of your data will remain safely in the app during this process!
When you're logged into an account in the app then your data is securely backed up every 24 hours when you open the app with an internet connection, and only you can ever access your backups using your personal encryption key.
More information about the encrypted backup account feature can be found here.