This Q is pretty old, but to keep things clean and for reference, I wanted to give a resolution. I couldn't get an answer out of Acronis KBs or forums.
I gave up on Acronis for backups, this was one of a number of experiences that I had with their backup software that was frustrating. Got a refund (had to fight for that) and moved to Barracuda, and have better success with their products.
One thing about Acronis compared to Barracuda was the return policy. Barracuda has a 30 day full return policy, whereas Acronis has nothing like that. That says something.
Still use Acronis products for cloning purposes.
