A number of YouTube videos can be found on the process of extracting the hard drive from a single bay My Cloud enclosure. One can then connect that hard drive to their computer using a; USB to SATA adapter, or a USB to SATA docking station, or a spare SATA port on the computer. To properly read the drive that computer would need to be running Linux, or a third party Linux driver to recover their user files from the fourth partition (typically an EXT4 formatted partition) on the drive.
There are a number of past discussions on using a third party driver to read the extracted My Cloud hard drive under Windows 10. One such past discussion:
My Cloud dead, how to see content on Windows 10?
https://community.wd.com/t/my-cloud-dead-how-to-see-content-on-windows-10/175311
