Power up your Mac and hold down the Command and R keys to enter the macOS Recovery Partition.
Check the box next to, show Time Machine in menu bar.
Enter Time Machine after clicking the Time Machine icon in the Menu bar.
Select the most recent backup of your hard disk and click Continue.Step 2: Restart Your Computer.Check the, back Up Automatically box in order to automatically back up your Mac to your chosen disks.Time Machine will back up most of your Mac automatically, but you might want to exclude certain files.Time Machine system requirements, before using Time Machine, you need an external storage solution, sold separately: External hard drive connected to a USB, FireWire, or Thunderbolt port on your Mac.In other cases, your Mac can be experiencing some major malfunctions: constant crashing, locked controls, slow boot times, missing files, etc.What Disk Utility looks like in El Capitan.You can now install macOS on the drive.You can selectively exclude files from your back ups by adding them to a list in the Time Machine Preferences.Check with the device manufacturer for compatibility and connection information.The macOS installer is designed to prevent you from installing macOS on a Time Machine backup disk.Your Mac should boot to a screen that says macOS Utilities.Peter Cohen contributed to an earlier version of this article.
Do you use Apple's backup feature?