Hello Mr. Nicoxnoise,
I am sure you will get the answer for all of your question's for Netbackup 7 VMWARE option from Symantec NetBackup (tm) 7.0 for VMware Guide
If the Exchange 2010 Full DAG Backups are working with Status Code 0 and the Netbackup Client Services and the legacy Services on the Clients ( MAILBOX Nodes and CAS Nodes) are started with doamin admin account.
The reason must be Circular logging.
Proceed up to Step 4 as per the above post
5. On the DR Exchange server, open the Backup, Archive, and Restore interface.
6. Click File | Specify NetBackup Machines
7. Click theClients/Policy Type tab, and select MS-Exchange for the Policy Type, and ...