How do I backup my MacBook Pro?
How do I backup my MacBook Pro so I can sell it?
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See: How to back up your Mac - https://support.apple.com/mac-backup
I would do it with Time Machine or a cloning tool instead of iCloud which will only save certain files and not configurations.
and:
Click on the link to read 'What to do before selling or giving away your Mac.' --> http://support.apple.com/HT201065