Thank you very much for your reply.
I understand that this may not be very helpful and that this situation may be stressful for you. We try to accommodate all users needs and export/import is on the table as well. However, we want to have control and not rely on 3rd party software for more than a security reason. Our export/import premium add-on is planned for released in late 2019.
Before that, if you have SQL knowledge you can export data directly from the db or use some 3rd party plugin for it. My dev has just pointed one out, but remember this is not our recommendation, just trying to give you some kind of direction. CodeCanyon Plugin.
Hope this helps a little.