There are a number of different ways you can do this.

The most basic way is to use a terminal program and just copy and save the output of the "show running-config" command.

You can also copy the configuration to a TFTP/FTP server if you have one by entering one of the following commands:

copy running-config tftp: all

copy running-config ftp: all

Of course, you can also use the Cisco Nexus driver in DataMiner to trigger the offload of the configuration to an FTP, TFTP, or SFTP server.
These actions can be accessed through the "copy config..." page button on the general page.

If you have the DataMiner Infrastructure Discovery and Provisioning (IDP) app then this app can do this for you in an automated way!