NetVault Backup Plug-in for Exchange backups will fail with an error similar to the following:
"Exchange store writer instance not found in VSS metadata"
"VSS component not found for database [DB NAME]"
"None of the VSS components for the selected databases have been found on server [SERVER NAME]"
VSS backups require the Microsoft Excahgne VSS writer to be active. If this is inactive, backups will fail.
The error "VSS component not found for database" can also occur when the Microsoft Exchange Replication service is not running. This is required in DAG environement.
From the Windows Command Prompt, run:
C:\> vssadmin list writers
Ensure that "Microsoft Exchange Writer" is running. If it is not running, then the most likely cause is a registry setting configured to disable the writer
The registry key is a dword variable "Disable Exchange Writer" in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\.
If this is exists, and is set to 1, then the writer is disabled. To enable, set this variable to 1 and restart the Exchange Information Store Service.
Note that restarting this service will disconnect users from Exchange.
