Hi,
Upgrading on same box is supported way to keep user info. I don't know the steps to move user/group/permission to another server.
I have not verified, but the combination of REST APIs may help you. You can check the Administration APIs here.
http://<NAC>:<PORT>/datamanagement/apis/public.html
However, we don't have further documents for these APIs at this stage. Additionally, I suppose you may need to edit JSON gotten using API manually before importing.
So, if you can create again, I recommend to do that.
Regards
Yas