Youngbowyer, 
Yes.  It is backed with rawhide.  It's the first ERC I have tried so I wanted to try and ensure its survival.  It was very clean and knot free on the back, but I wanted to back it anyway.  
For what it's worth, I did remove about half the sapwood and chase a ring on the back.  I wanted to be sure and have a good bit of that heartwood left after tillering and it would have been all sapwood otherwise.  I can get whitewood anywhere, but that vibrant red is pretty rare.  Chasing that tiny little ring was a *&%^!!! But, it was worth it I believe.