Remove the My Cloud hard drive from it’s enclosure. Use a USB to SATA adapter/enclosure/docking station to connect the drive to your computer. Then use Linux boot disk/flash drive or install Linux drivers in Windows to access the My Cloud hard drive contents. From there you can copy the contents to another drive and or attempt to “unbrick” the My Cloud hard drive using one of the various unbrick methods (use forum search feature, magnifying glass icon upper right to find unbricking discussions).
https://tutorials.ubuntu.com/tutorial/tutorial-burn-a-dvd-on-windows
https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-windows
