Do you mean a one time copy? A scheduled copy/update? One way or both ways? Do you need to preserve issue id numbers? Is the mirrored project in the same JIRA instance.
CLI Plugin for JIRA may also have some enablers that would help.
cloneProject will do most of what you want. It doesn't support keeping issue id numbers, but I have done that before using a CLI script and it could probably be added as an option - create an issue . Essentially it means creating and then deleting an issue to fill any holes in the sequence of issue id numbers.
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