When you want to backup the configuration of device on U2000, you need to add the device first, and then preform the save and backup configuration operation, how to make sure save configuration succeed is described in my another case, the like is below:
https://forum.huawei.com/enterprise/en/forum.php?mod=viewthread&tid=471557
The principle of U2000 backup configuration of device is that the device will ftp/sftp to U2000 and put the saved-configuration to U2000 server.
So we need to make sure the device can ftp/sftp to U2000.
How to do that?
We just need add two commands on device:
1. sftp client-source –a 10.10.10.1 –vpn-instance NMS_U2000 //this command indicates that the sftp client source as 10.10.10.1, it is different for different devices, and if there is no vpn-instance binding to this source, the vpn instance parameter is unnecessary.
2. set net-manager vpn-instance NMS_2000 //this command indicates that the management plane is working in vpn instance, if there is no vpn instance , this command is unnecessary.
After setting the stelnet parameters, you can try to save configuration of device, it will succeed.

