When you take a backup, also note the HMI's firmware version (found in System Settings → Info). Restoring to mismatched firmware causes boot loops.
The benefits of a well-designed backup plan for MCGs HMI systems are manifold: mcgs hmi backup
Access the HMI’s IP address via an FTP client. You can often find the project folders within the Flash or HardDisk directories of the device. When you take a backup, also note the