Troubleshooting RMAN backup or restore errorsAn RMAN backup error can originate from NetBackup or from Oracle, as follows:On the NetBackup side, an error can be from the API, from the NetBackup server or client, or from Media Manager.On the Oracle side, an error can be from RMAN or from the target database instance.Veritas suggests that you use the following steps when troubleshooting a failed operation:Check the logs to determine the source of the error.Troubleshoot each stage of the backup or restore.