Desktop and Mobile Software
There are several options available depending on what you'd like to accomplish. You can view the software download page directly at this link. Here's a pic for reference:
First we'll take a look at what I consider the main app to be used – WD My Cloud. This is a desktop app that can be installed on your PC or laptop. The app can reach back to My Cloud devices on your home network even while you are away. This is accomplished by linking via your Western Digital My Cloud login.
You're limited to the confines of this app while away from home, but you can browse any of your My Cloud devices and drag / drop files to and from them at will. It pops up a copy status screen just as if you were doing these copies from within Windows:
Another piece of software is WD SmartWare. This is a licensed app (3 licenses packaged with the My Cloud Mirror), which enables multiple PCs to backup directly to the My Cloud, filling the backup gap under Windows. Mac users can simply point Time Machine directly to the related share on the My Cloud. Here's a look at SmartWare once installed:
As you can see, the software doesn't really discriminate on what goes to where, and is fairly flexible in that regard. Backups can go to connected USB devices, networked My Cloud devices, and even to a users DropBox account, if they so desire.
Also available is a My Cloud app for mobile devices such as Android and iOS. Here's a few shots from the iOS solution in action:
The app is fairly comprehensive and caches up to several GB of recently accessed files. The cache enables offline viewing in cases where no cell service is available, which is handy for flights, etc.