SMS Backup Secret is an iPhone application designed to help users securely back up their important SMS messages. The process involves taking screenshots of the desired messages and adding them to the app. A unique feature of this application is the app lock, which allows users to protect their data with a passcode, ensuring that only authorized individuals can access the stored messages.

The application emphasizes user privacy by not requiring any login accounts and not analyzing or uploading user data to the internet. Users are prompted to remember their passcode for future access. Additionally, a video tutorial is available to assist users in navigating the app and maximizing its features. This makes SMS Backup Secret an effective tool for anyone looking to safeguard their private messages.