In the course of my testing of macOS Sierra this week, I decided to turn on iCloud Desktop and Documents syncing. This was my reaction:
I can’t discuss the details of my testing yet because the macOS Sierra NDA still applies until Sierra is released on September 20, 2016. However, for those Mac admins who have also tested this and wish to block it in their own environments ahead of macOS Sierra’s release, I’ve built a management profile and made it available via the link below:
https://github.com/rtrouton/profiles/tree/master/DisableiCloudDriveandDocumentSync
This profile has been tested and works on OS X 10.11.6 and later. It restricts access to the iCloud Drive settings in the iCloud preference pane by graying out iCloud Drive and making it non-selectable.