If you have Cisco TelePresence Management Suite deployed in your organisation to manage our devices, then it can be used to keep a backup of the config (and you can compare what has changed from the backup to what is currently running easily).
If you don't have TMS, then your best options are to do it with scripts and either:
1) Make an SSH connection to the Expressway and take a copy of the output of an "xconfiguration" command - this will contain most of the settings
2) Make a HTTPS connection to Expressway and and Create system backup via the https://your-expressway/backuprestore page.
Wayne -- Please remember to rate responses and to mark your question as answered if appropriate.
I have questions from the above guides:
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