MacBook Pro iCloud backup
How can I be sure that everything on my MacBook Pro is fully backed up on the iCloud?
MacBook Pro 13″, macOS 10.15
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You can't as Apple's iCloud service does not provide a means to back up their desktop or notebook computers to the Cloud. iCloud only provides syncing service for a number of your apps, but does not back them up.
iCloud backup is only available for iOS or iPadOS devices.