Confluence doesn't have any mirroring functionality built-in to the product. We do offer a "Clustered" licence for Confluence, but this is designed to improve scalability, and has no features for high-availability.
One option you could investigate is using the Confluence AutoExport plugin - which can be configured to regularly export Confluence content to static HTML files that can then be served up by another static HTTP server as a backup or high-throughput mirror.
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