use iCloud as backup for Mac hard drive
How do I use iCloud as backup for Mac hard drive?
MacBook Air 13″, macOS 10.14
How do I use iCloud as backup for Mac hard drive?
MacBook Air 13″, macOS 10.14
You don't. iCloud can sync a lot of the data you have on your Mac, including documents, calendars, messages, contacts, and photos, but it can't be used as a true backup.
To back up your Mac, you'll need an external hard drive. You can then use Time Machine:
Back up your Mac with Time Machine - Apple Support
use iCloud as backup for Mac hard drive