In Microsoft SharePoint Foundation 2010, you can create new sites in a site collection. However, you cannot copy sites in the Site Managers page. If you try to copy a site, you receive the following error message:
Even if you have full control permission, you cannot copy sites. Only site collection administrators can successfully copy sites.
Note This issue also occurs for copy and move operations of single items.
This issue occurs because you must have higher level permission to copy a site.
To work around this issue, copy sites in the Site Managers page as a site collection administrator.
Note To work around this issue for single items, copy or move the items in the Explorer view of the document libraries.