well, you seem like an advance user and also aware this is running Debian Linux.
So yes, you can clone the disk with any Linux compatible commands and/or utils. If you need to remove the HD first, depending the route you select, as mentioned before, it will void you warranty.
And to get back to original default state from WD, there are quite a few debrick guides such as this one.
http://community.wdc.com/t5/My-Book-Live/GUIDE-Debrick-MyBookLive-v2-0/td-p/567582
