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Add possibility of rename Backup folders. If you have only one computer, it go fine, but if you have more than one, it ends being very confussing. Due iCloud Drive issues, I've changed all of my Macs...
The real thing could be implement this as OneDrive do in Windows and iCloud Drive in macOS: same folder does not matter how many PC/Mac you have.
I know it is not easy when there is interoperation between Windows and macOS, but perhaps this could be a good selling point.
What I actually have is one folder called "Documentos", and use that folder for my equivalent "Documents" folder of each Win/Mac, and original Documents in Win/Mac are empty and not used. That way I have all my working documents synchronized between all platforms.