MSSQL 2016 on Windows 2016, running DP inet service under local system account and impersonating domain user, you will get error.
[Normal] From: OB2BAR_SQLBAR@server "(DEFAULT)" Time: 2017-04-24 14:35
Starting backup of database msdb. Required backup type is full.
[Normal] From: OB2BAR_SQLBAR@server "(DEFAULT)" Time: 2017-04-24 14:35
SQL statement:
BACKUP DATABASE (msdb) TO
VIRTUAL_DEVICE = 'Data Protector_(DEFAULT)_msdb_123511567_0'
WITH NAME = 'Data Protector: 2017/04/24 0006', BLOCKSIZE = 4096, MAXTRANSFERSIZE = 65536;
[Critical] From: OB2BAR_SQLBAR@server "(DEFAULT)" Time: 2017-04-24 14:35
Error has occurred while executing a SQL statement.
Error message: 'SQLSTATE:[42000] CODE:(262) MESSAGE:[Microsoft][ODBC Driver 13 for SQL Server][SQL Server]BACKUP DATABASE permission denied in database 'msdb'.
SQLSTATE:[42000] CODE:(3013) MESSAGE:[Microsoft][ODBC Driver 13 for SQL Server][SQL Server]BACKUP DATABASE is terminating abnormally.
'
If you run the same backup running DP inet service under domain account with necessary rights it works fine. Please use this as workaround meanwhile issue is resolved and open support case for to get a possible solution.
Best Regards