Boot your computer up with a Linux distro like ubunto or mint and see if you can see the files then. Lots of NAS and other network attached storage devices use a Linux based file system. Windows wont see it. You can burn a DVD for the installation disc for the latest distro. Boot the system off of that DVD and instead of installing Linux, just use the live linux environment that it provides. It should show you all drives connected mounted to the system including the drive that your trying to get data from. If you see the data then. Then you will want to insert a USB thumb drive that is equal to or greater than in size to the data to be copied off the drive that is formatted FAT32 or NTFS. And copy the data from the cloud drive to the USB Thumb drive. When copy is complete. shutdown computer. Remove the DVD. Boot the computer normal and your USB stick has all your data in either FAT32 or NTFS file system which Windows can read.
I had a Buffalo NAS that died and this is the method I used to get the data off of it, and migrate the data back to the land of Windows.
The worst thing anyone could do is when windows detects the drive is format or create a new partition. If you accidentally did this then your issue has gotten far worse.