Why not consolidate all your music collections from the various PCs into one repository on the MyCloud? Then access this music library from each PC?
I have all my music stored on MyCloud, and access it using MediaMonkey as a network drive on two PCs, and via DLNA using various Android devices. I have no media stored on any of these devices.
I back up the MyCloud to a USB HDD. I don’t use any of the WD backup or sync apps…