Use of backup
Can I restore from an iCloud backup of my MacBook to a new (for me) iMac?
iMac Line (2012 and Later)
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There is no iCloud backup for Macs. However, files stored on iCloud Drive can be synced to a new Mac using the corresponding AppleID.
If you still have access to the MacBook using Migration Assistant to transfer files remains the best way to do it.