How does Juniper MIST manage configuration backups for SSR deployed as a WAN Edge?

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The WAN edge template in Juniper Mist™ WAN Assurance enables you to define common spoke characteristics including WAN interfaces, traffic-steering rules, and access policies. You then apply these configurations to the Juniper® Session Smart™ Router deployed as a WAN edge device. When you assign a WAN edge device to a site, the device automatically adopts the configuration from the associated template. This automatic process enables you to manage and apply consistent and standardized configurations across your network infrastructure, streamlining the configuration process.

You can have one or more templates for your spoke devices.

Once the template has been created, you can choose the option of "Export Template" from Organization --> WAN --> WAN Edge Templates --> Select a template --> More --> Export.

This creates a JSON file for the template and downloads the file onto your local desktop. You can later on import this template in case, you loose the original template.