Gaia Space Importer
Gaia Space Importer lets Confluence administrators import spaces that where previously exported from Confluence and are saved in XML.ZIP format.
Import is accessible from the Confluence Administration menu. Administrator shall supply a valid file, space name and space key and voilà !
1st step
Export the space you want to duplicate in XML.ZIP format
2nd step
Import the space to create a new space with a different name and key, select pages and/or templates
The space will be duplicate as you may import them with different space #key name