Recently, I had to format my MyCloud and start from scratch. I was grieving the fact that I would typically have to wait hours and hours to transfer my initial 200+ GB of data (even via USB 3.0 directly from an external hard drive) to my MyCloud!
Then, a candle began to flicker in my empty head. I took an old crossover cable and directly connected my MacBook Pro directly to the MyCloud. It was like magic. I was able to transfer the initial 200+ GB of data in a fraction (less than a couple of hours) of the time that it would have taken before!
Crossover cables work in a pinch to transfer an initial large amount of data directly from another device in order to get your MyCloud up and running.