Instead of copying the site as a template, when I'm in a situation where I need to do this I just run the
Export-SPWeb command in Powershell. If this is a list, not a document library, the
-includeversions flag won't matter but you'll definitely want to utilize
-includeusersecurity to preserve all of the Author/Editor fields (you'll need to add this flag during both the export and the import sequences).
Export-SPWeb http://website/web -path d:\yourfilename.cmp -includeusersecurity -verbose
Import-SPWeb http://newlocation/web -path d:\yourfilename.cmp -includeusersecurity -verbose
If this subsite has any size whatsoever, I strongly recommend creating a new directory for the .cmp file(s) to reside in. SharePoint by default will break up the export into ~30MB files. The
-verbose flag is completely optional; Export-SPWeb also creates a log file that repeats the same information you'll see generated on-screen when you use
-verbose. I like to use it as a way of making sure that the program is doing something. :)
Also bear in mind that adding on
-includeusersecurity when you're exporting the website to an entirely different farm can significantly increase the length of the import, as the site will need to add each and every single user into the rootweb.