If it's the CLI save you want, take a look at...
https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-Save-Commit-the-changes-made-via-CLI-on-the-Wireless-Controller
How to Save/Restore:
https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-save-and-back-up-a-config-file-on-the-IdentiFi-Wireless-Controller
Doug Hyde
Director, Technical Support / Extreme Networks