Copying a Multisite Network to a New Subdirectory on the Same Domain

Hi,
I have multi-site installed on a sub-directory of my domain "domain.com/sub-test" and want to copy the entire network across to "domain.com/sub-live" whilst keeping sub-test for ongoing development.
All content is the same except that they are built on different sub-directories.
What is the best way to handle this?

thanks in advance
Paul