How to backup Mac via Time Machine
Time Machine is the built-in backup feature of your Mac. To use it, you need an external storage device.
When you connect an external hard drive directly to your Mac, you might be asked if you want to use the drive to back up with Time Machine:
Click Use as Backup Disk.
Alternatively, open Time Machine preferences by hitting cmd+space and typing Time Machine.
Click Select Backup Disk
Select a backup disk from the list, then click Use Disk.
After you set up Time Machine, it automatically makes 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 disk is full.
To restore specific items from a Time Machine backup
Open a window for the item that you want to restore. Choose Enter Time Machine from the Time Machine menu
Find the items to restore:
Use the timeline on the edge of the screen to see the items in your Time Machine backup as they were at that date and time. The timeline may also include local snapshots.
Use the onscreen up and down arrows to jump to the last time the contents of the window changed. You can also use the search field in a window to find an item, then move through time while focused on changes to that item.
Select an item and press Space Bar to preview it and make sure it's the one you want.
Click Restore to restore the selected item, or Control-click the item for other options.
To completely restore your Mac, use the “Restore from Time Machine Backup” utility in macOS Recovery. The disk you're restoring is erased before receiving the macOS and other contents of your Time Machine backup.
To copy just your files, settings, or user accounts, use Migration Assistant.
Time Machine is a very powerful tool with many capabilities. You can learn more about it by visiting Apple’s website: https://support.apple.com/en-am/HT201250
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