On the WebUI do the following:
- Go to the Maintenance Tab
- Select "Backup Flash" on the left
- Click on "Create Backup"
- Once completed, click on "Copy Backup", it will take you to another screen
You will need to send the file to a TFTP, FTP or SCP server.
You will then have "flashbackup.tar.gz" file, which you can open and look under the config directory for the active configuration.