Hi Stuart!
The only way to keep two (or more) JIRA instances replicated is setting a high availability scenario. This guide, from our bag of Jricks, can help you on this matter. :)
If you're planning to do this through some JIRA feature, it doesn't support data replication by itself. I have checked by some plugin that could do it but I didn't found none. In advance, you could also create an application that "talks" with JIRA via REST API and use it to replicate the issues on another instance.
I hope it helps!
Best regards,
Lucas Timm
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