I am not sure if you are asking what software to use to sync between a Linux computer and the EX2. If you are, then I recommend you look into the command line linux tool rsync. rsync is included in most Linux distros and most likely you already have it in your Ubuntu Mate distro. rsync is also installed on EX2 as well. Search on this EX2 sub-forum. I have recently seen a thread or two with people offering their working solutions using rsync between a Linux machine and EX2.
Besides those rsync-related threads, I have also commented recently on a thread, where two different directions of mounting using Samba is discussed. That may or may not have any use for you. That thread is here → http://community.wd.com/t5/WD-My-Cloud-EX2/Mounting-MyCloud-EX2-on-a-Linux-desktop-using-Samba/m-p/864001
