Regarding Data Catalog export, all the Servers with its catalog metadata will be exported. Once Production export is done, Data Catalog admin can make necessary changes to Production Servers.
Also, since Server is exported along with catalog metadata, it also includes categories and tags, so they are exported as well.
I found these information in the following[ user manual](https://community.denodo.com/docs/html/browse/8.0/en/vdp/data_catalog/administration/import_export/import_export):
Hope this helps!