The iCloud drive can be backed up to Backblaze on Mac as long as the files are present locally on the computer itself and not stored only in the cloud. As long as the "Optimize Mac Storage" feature and "Store in iCloud" feature, which move files off the computer and onto the cloud, are disabled the drive will be able to back up to us.
These options can be found in the "Apple ID Menu" and "Storage Management" management window.
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