Secure storage and secure boot on your iMac Pro
Your iMac Pro includes security features to protect what’s on your computer and to prevent unauthorized software apps from loading during startup:
Secure storage: The storage drive of your iMac Pro is encrypted with hardware keys to provide advanced levels of security. In the event of a catastrophic failure, data recovery may not be possible, so you need to backup your system to an external source. You can set up Time Machine or another backup plan to regularly back up the contents of your computer. See Back up your files with Time Machine in the macOS User Guide, and the Apple Support article Back up your Mac with Time Machine.
Secure boot and Startup Security Utility: Support for secure boot is on automatically. It helps ensure that only legitimate operating system software loads on your computer at startup.
In the unlikely event that your iMac Pro won’t start up because it detects an untrusted component, your computer is already set to boot from a secure recovery partition to automatically correct issues where possible. To learn more about the Startup Security Utility or to find out how to set other options, such as booting from an external device, see the Apple Support article About Startup Security Utility.
Learn more. See the Apple Support article Mac computers that have the Apple T2 Security Chip.