"Manage Backup" and the way it moves the Desktop and Documents folders is incredibly confusing and scary, and is poorly documented.
You badly need to fix how "manage backup" works, especially since the default behavior changed in newer installations of Windows 10.
I used OneDrive on older computers running Windows 10, manage backup was disabled, and OneDrive worked more or less intuitively.
I just bought a new PC, and manage backups was enabled. I didn't realize the significance of this. The fact that my Desktop and Documents folders changed locations was extremely unintuitive.
Also, the relationship between the "choose folders" and "manage backup" settings was confusing.
Worst of all, when I disabled Manage Backups, I believe my visible desktop suddenly became empty, when Windows relocated my Desktop folder back to its default location in the root of my home directory. I now know that the missing Desktop files were still available in OneDrive, but this sure wasn't obvious at the time.
This is all incredibly confusing to most users, who may have multiple PC's, some with Manage Backups enabled, others with it disabled. You badly need to fix this, and to better document it online. It would be especially disturbing to a user who was travelling with a laptop to a location with a poor internet connection, and for whatever reason turned off Manage Backups. Poof! the desktop would be empty.