Who can copy a space?
To copy a space you will need to
have space admin permission in the space you want to copy
have at least view, edit and delete permission for pages, blog posts, and attachments in the target space (the space you want to copy to)
You will also have to be a member of the Confluence user group added to the Copiers Group. This configuration setting is managed by the Confluence global administrator in the Copy Space - global configuration.