GoodSync automatically synchronizes and backs up all your photos, music, email, and other important files between all your desktops, laptops, servers, and external drives.
Version 12 has been released, see its New Feature List
Explore files and folders of GoodSync Connect computers, serve files and other from iOS device to GoodSync Connect computers.
So your IOS device act as a portable storage for GoodSync Desktop.
iOS 12 and higher