Hi!
The plugin is not up to date, that is the problem, as I suspected. Once you update, the duplication will start working as it should 🙂
Yep, there is an export/import feature of course. I recommend updating all installations first to the latest release. Also, I do not recommend using this across separate WordPress installations, as term IDs, post IDs, user IDs etc.. are different for each installation. The filter/exclusion and other information that use this data will mismatch, or won’t work at all. The exceptions are test/live servers, where the live server is the exact copy (including database rows) of the test server.