In Netsight open the web help and search for "How to Set Up Third-Party Device Support".
There you'd find a description how to add a custom device definition file = script.
I've tried it myself but the new file wasn't visible in the pull down menu to select - not sure what I'm doing wrong - I've restarted Netsight & the client.
The part in the file for the config backup looks like below but as I've mentioned I wasn't able to test it so I'm not sure whether it's correct..
scp...on this position is wrong...because it describes the method of moving config from switch to netsight-server / inventory-manager.
When your Netsight-Sever is running on linux you need to create a cron-job using root-rights.