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There are two ways to use iCloud for this type of synchronization. The simpler way is to work on the files in iCloud, and only make local copies for backups and archives. This is easier because you don’t have to do any synchronization, just pull down copies when you want to back them up locally.

You can use iCloud Drive as a means of synchronizing local copies, as you’ve said you would prefer. Of the two methods, this is inevitably the more complicated option, as it requires local software that copies from each computer whenever you make changes to the local copy of each file. If you’re not careful, the iCloud copy won’t be up to date, and you could end up with different versions of files on your Mac and PC.

To implement the second method, you’ll need folder synchronization software running on both your Mac and your PC. It must be able to see your iCloud Drive so it can copy to it, and it must run automatically. For your Mac, the Mac App Store has good options, such as Folder Sync ($8.99, apple.co/2gwdzn5).

I upgraded to a 27-inch iMac with a 1TB Fusion Drive, but every time it tries to run a Time Machine backup, the process stalls at the same point. I have even