When I enable Sync Desktop Content on any desktop folder on my Windows 10 PC, is it a true sync to the WDH or is it just mirroring from the Desktop to the WDH? When I change anything in the WDH folder, will it be synced back to the desktop folder? (I am not talking about the Sync My Could Home Content feature, but specifically about the Sync Desktop Content.)
Yes, it is true sync feature on the My Cloud Home device. If you make any changes through the mycloud.com in the sync folder data it will show up in your computer sync folder as well.
You can refer the link given below to know about configuration and setup of Desktop Sync with My Cloud Home.
by using desktop sync, if either the WDH or the desktop is switched off or restarted, is the Sync will be disconnected.