Hi Andy and Marianne,
First thanks to you.
The below are the details of Netbackup Server and netbackup Client.
Master Server: Netbackup 7.0, running on Windows Server 2003 R2 x64 bit.
Netbackup Client: Netbackup client 7.0, running on Windows server 2003 R2 x86 bit.
Netbackup Policy: MS-Windows
Backup Selection: ALL_LOCAL_DRIVES
Shadow Copy Components:\
However the C: drive will work fine, but the shadow copy are not and have not any VSS issues on client side event logs.
I have seen only only when the Shadow Copy backup starts the VSS is turing on and will stop when backup finish.