
Check the “Back Up Automatically” box in order to automatically back up your Mac to your chosen disk.Click the Time Machine icon and click “Select Backup Disk” to choose which disk you'd like to use as a Time Machine backup and click “Use Disk”.Select System Preferences from the Apple menu.It backs up the entire contents of your Mac files hourly, daily and weekly, as the drive gets full, Time Machine will delete the oldest backups and replace them with newer versions. When Time Machine is enabled, it takes periodic snapshots of all your files and catalogs them on the hard drive you choose as backup disk. It allows users to restore the whole Mac system, multiple files, or a single file and works with any external or internal volume that connected to your Mac via USB, FireWire, or Thunderbolt. It creates incremental backups of files that can be restored at a later date.

Time Machine is a Mac built-in backup utility developed by Apple.

What is Time Machine and How Does It Work?.
