How do I transfer data from the iCloud to our new computer

See these articles https://support.apple.com/en-us/HT205749

https://support.apple.com/en-in/guide/imac-pro/apd831707cb3/mac

https://support.apple.com/en-us/HT208682

When iCloud Drive is set up https://support.apple.com/en-in/HT204025

And desktops and documents box is turned as on https://support.apple.com/en-in/guide/mac-help/mchle5a61431/10.14/mac/10.14

You can download files from iCloud.com to Mac see the article https://support.apple.com/guide/icloud/upload-and-download-files-mmad632d1df2/icloud

Where on iCloud are your backup files? Are they in the iCloud Drive and which files/folders are there? How did you set the drive up?