60 mbps, megabit per second, are similar to 7.5 Megabyte per second. This is far too low for any My Cloud.
It depends on how you benchmark, but even within the Windows file copy dialogue you should get values higher than 60 Megabyte per second aka 480 mbps if copying larger files.
I did a test here in the demo network with 1-bay My Cloud and a dummy file with 100 GB file size, created from Windows commandline with “fsutil file createnew”. Here is the screenshot of the copy dialogue of Windows 10:
Sorry for German language but this Windows is German.
Calculated time should be somewhere arround 20-25 Minutes for copying 100 GB onto the My Cloud Single Bay.
The throughput graph oscillates between 60 MB/s (480 mbps) and 90 MB/s (720 mbps), average is somewhere around 75 MB/s (600 mbps).
Hope this helps.