One of the most important steps you can take to protect your data is to make a backup. The operating system bundled with every Mac is macOS and includes an application called Time Machine. When enabled, Time Machine creates a backup of the data on your Mac and copies it to an external storage device. To set up and start a Time Machine backup, follow these steps:
- Open System Preferences
- Click Time Machine
- Select a destination for backups
- Allow a backup to happen
- Verify the backup is working
For additional information, read the detailed support document from Apple linked below.