Question : Backup on Hyper-V Cluster

First I am not a Hyper-V guy i am just starting to get to know it...
There are 2 machines operating in a cluster Hyper-V and i have an issue with backup.

Here is my issue. While doing my backup with Backup Exec everything goes well except for backing up c:\clusteredStoage\Volume1. I get the following error every time.

Backup- C: V-79-57344-33928 - Access is denied.
Access denied to directory ClusterStorage\Volume1\.

Should this directory be backed up?
Is there another way to do this?

Answer : Backup on Hyper-V Cluster

Support for CSV volumes started from Backup Exec 2010.
http://support.veritas.com/docs/326843
Wait for few days and use Backup Exec 2010 R2.