Now I am trying just 50 items, files, and it will not complete.
Or it will take so long it is useless.
If this drive cannot do better than it makes me question the usefulness of the WD product, and it makes me nervous to think I have so much critical information on this drive.
How is the Mac connected to the same local network as the My Cloud? Using Ethernet or WiFi? Is the My Cloud directly connected (via Ethernet) to the local network router? Is the router Gigabit capable?
Other things to check, make sure there isn’t a sleep setting that shuts off the computer or puts the network port to sleep. Use Gigabit networking where ever possible.