While songs are being written, your computer enters the suspend and hibernation modes, and the screen saver does not function.
There has been a printing error in the Help file.
When creating a CD or operating Check-in/Check-out, please disable programs that might interrupt the normal proccess such as screen saver.
The Backing up data to a disk section of Help states:
During a backup or restoration, do not shut down the system using your computer's suspend or hibernation mode, and do not use the screen saver. Doing so may cause data loss, and backup or restore may not function properly.