NetWorker：NVP vProxy：MSVMAPPAGENT SQLトランザクション ログ バックアップが失敗する「MSSQL Agent failed to create a transaction log backup.」

YYYY/MM/DD HH:MM:SS INFO:   [89] MSSQL: Executed MSSQL Agent operation 'backup_transaction_log' on guest VM.
YYYY/MM/DD HH:MM:SS INFO:   [89] MSSQL: Executed MSSQL Agent operation 'monitor' on guest VM.
YYYY/MM/DD HH:MM:SS INFO:   [89] MSSQL Agent: Performing transaction log backup for SQL instance 'VM_NAME'
YYYY/MM/DD HH:MM:SS ERROR:  [89] MSSQL: MSSQL Agent: 
YYYY/MM/DD HH:MM:SS ERROR:  [89] MSSQL: backup_transaction_log: Failure monitoring progress: MSSQL Agent: 
YYYY/MM/DD HH:MM:SS ERROR:  [89] MSSQL: MSSQL Agent failed to create a transaction log backup.
YYYY/MM/DD HH:MM:SS ERROR:  [89] MSSQL: Backup of the application "MSSQL Agent" on the virtual machine "VM_NAME" has failed.
YYYY/MM/DD HH:MM:SS INFO:   [89] MSSQL: Disconnected from MSSQL Agent in "VM_NAME".

ターゲットVMのC:\Program Files\DPSAPPS\MSVMAPPAGENT\logs\msvmagent_appbackup.logには、次の情報が表示されます。

52701:msvmagent_appbackup: Command line: C:\Program Files\DPSAPPS\MSVMAPPAGENT\bin\msvmagent_appbackup.exe -i - 
37693 MM/DD/YYYY HH:MM:SS msvmagent_appbackup NSR info SQL Connection to VM_NAME is created. SQL Server Version is 13.00.5026
...
153887:msvmagent_appbackup: Microsoft SQL server documentation provides details about the following SQL Server Provider error:
38008:msvmagent_appbackup: The server principal "NT AUTHORITY\SYSTEM" is not able to access the database "SQL_DB1" under the current security context.
153416:msvmagent_appbackup: (Error: 916)
37938:msvmagent_appbackup: Failed to obtain filegroups for SQL_DB1.
Backing up SQL_DB1...
172257:msvmagent_appbackup: Backup of SQL_DB1 failed.

MSVMAPPAGENTは、データ保護操作のためにSYSTEMアカウントで実行されます。  VM内のすべてのSQL Serverインスタンスを構成して、「NT AUTHORITY\SYSTEM」アカウントのsysadmin権限を付与します。