Import/Export/Backup Config Manager

Is your feature request related to a problem? Please describe.
I frequently encounter issues where NGINX Proxy Manager (NPM) becomes unusable due to custom configurations. It would be incredibly helpful if the Admin Panel included built-in functionality to back up, export, and import configurations or sync multiple NPM systems together for high availability. This would allow for seamless recovery by restoring settings to another instance without manual intervention.

Additionally, I’d love to see the Admin Panel operate independently—either as a separate service or running on a dedicated NGINX instance. Currently, if the Docker container fails or an error occurs, the Admin Panel becomes inaccessible, requiring users to manually exec into the container to reset configurations or rebuild the database. This recovery process is often difficult and, in my experience, not always successful. Decoupling the Admin Panel from the main NPM instance would greatly improve reliability and ease of recovery.

Start by mapping the Admin Panel, NGINX Proxy Manager container, and configuration or database recovery flow described in the issue. Clarify whether the goal is backup/import/export, synchronization for high availability, Admin Panel decoupling, or all of these. Done requires an agreed scope and design that supports recovery without manually entering the container.