You can set up Time Machine or another backup plan to regularly back up your files on the computer. See the Apple Support article About encrypted storage on your new Mac. In the event of a catastrophic failure, data recovery may not be possible, so you need to back up your files to an external source. Secure storage: Your MacBook Air storage drive is encrypted with keys tied to its hardware to provide advanced levels of security.
Your MacBook Air provides security features to protect what’s on your computer and prevent unauthorized software apps from loading during startup: