To backup the Windows 2012 Hyper-v cluster in not possible as W2k12 is not supported yet however you can install the remote agent for windows on your Vms and back them up as Physical machine,
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Hi,
1. upgrade to ontap 8.1.1 as the previous versions have an issue with cifs shares as reported by netapp themselves
2. after the upgrade, you needs to block port 10000 on the backup exec media server (outgoing only)
Please find below
An explanation of the "Overwrite Protection Period" and the "Append Period"
http://www.symantec.com/business/support/index?page=content&id=TECH5459