Please provide the following?

NetWorker server version?

Operating system and version?

What type of NAS?

Has non full backups ever work?

What is the client's backup command used?

What is in the client's Application Information field?

For NDMP backups, older NetWorker versions do not support level=incr.  Instead differential backups are supported.

NetWorker server version?

-->Networker 8.2 SP1 & Networker 9.1

Operating system and version?

-->Windows Server 2012 R2

What type of NAS?

-->Huawei Device

Has non full backups ever work?

-->Yes, if specify the special level, incremental backing up is working

What is the client's backup command used?

--> default command with GUI: nsrndmp_save -T dump

What is in the client's Application Information field?

--> BUTYPE=Y, DIRECT=Y, HIST=Y, UPDATE=Y, USE_TBB_IF_AVAILABLE=Y

I do not see Huawei  as a supported NAS device.  Please look at the following document:

NetWorker Hardware Compatibility Guide, starting on page 262

https://support.emc.com/docu34173_NetWorker-Hardware-Compatibility-Guide-.pdf?language=en_US

Also, As per NetWorker 8.2.x Administration Guide,

EMC Celerra, Isilon, VNX, and NetApp filers with NDMP version 4 or later support token-based backups (TBB) to perform NDMP full, incremental, and level 1-9 backups. NetWorker supports the same number of incremental levels that the NAS vendor supports. EMC Celerra, Isilon, and NetApp documentation provide the maximum number of incremental levels that the TBB incremental backup can support.

When you configure TBB after you update the NetWorker server from 7.6 SP1 or earlier, the first incremental or level 1 to 9 backups does not occur until after one complete full backup.

Filers that do not support TBB, do not support incremental backups. If you select the level incr, the NetWorker server performs a full backup. However, you can schedule level backups to function like incremental backups. For example, define a weekly backup schedule of full on day 1, level 1 on day 2, level 2 on day 3, level 3 on day 4, and so on.

Verify the NAS storage vendor supports NDMP incremental backups before you use this feature.

Using TBB is available and supported on your NAS, then you define this in the NetWorker client's Application Information field:  USE_TBB_IF_AVAILABLE=y 

Has non full backups ever work?

-->Yes, if specify the special level, incremental backing up is working

Please elaborate.  How exactly?  Through the NetWorker schedule?  Backup command?

Through the Networker schedule specifying the level 1-9, the job can do incremental backing up. the filer supports TBB. And I found that Networker didn't send "BASE_DATE" parameter in "DATA_START_BACKUP". Is the parameter "USE_TBB_IF_AVAILABLE=y" used to control the "BASE_DATE"?

If the backup levels used are 1-9 then you are performing differential backups, not incremental backups.

Has incremental backups ever worked when the backup level is set to incr?

If you are indeed using a Huawei NAS, which is not on the list of supported NDMP NAS devices, then there is little to be done other than submit an RFE requesting that the Huawei NAS be qualified for NetWorker NDMP support.

Is there any link for submit RFE requesting?

No, always doing full backing up if setting to "incr". It's strange that Networker didn't send "BASE_DATE" parameter.

Do you know how to submit an RFE requesting?

Thanks a lot.

You must open a support ticket with your support to submit RFE.

Hi Hrvoje,

Is there any way to do NDMP certification with Networker? 

Thanks.