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.
Do you use templates with Confluence? Take part in a remote 1-hr workshop. You'll receive USD $100 for your time! We're looking for people to participate in a remote 1-hr workshop...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs