Final answer:
The built-in tool for disk backups on a Mac OS X is Time Machine, which provides automatic and scheduled backups of all user data.
Step-by-step explanation:
The built-in tool available on a Mac OS X machine to perform disk backups is called Time Machine. Time Machine is an easy-to-use backup system that requires minimal setup. Once an external storage device is connected to your Mac, you can enable Time Machine, and it will automatically make periodic backups of all your files, including apps, music, photos, email, and documents.
Time Machine keeps hourly backups for the past 24 hours, daily backups for the past month, and weekly backups for all previous months. The oldest backups are deleted when your backup drive is full. It's straightforward to restore files from Time Machine backup; you can do it right from the Finder or by entering Time Machine and navigating through the backup to find the version of the file you're looking for.