GoodSync automatically synchronizes and backs up all your photos, music, email, and other important files between all your desktops, laptops, servers, and external drives.
GoodSync Server can be installed directly on a Western Digital NAS device. It serves files from the device, so they can be accessed by GoodSync on desktop.
GoodSync for Synology NAS is installed directly on the NAS, it serves file from the NAS via GSTP procotol to other GoodSyncs.
GoodSync for QNAP NAS is installed directly on the NAS.