Hi Ebba,
First you need to request the preservation of your test site https://test-cernchoir.web.cern.ch/ by filling this form. The “Associated Official Site name” in your case will be club-choir.
After your test site is moved to the Cloud (new infrastructure), you need to delete the https://club-choir.web.cern.ch. You can find the owner through the old web services portal in case you don’t have admin permissions.
After the old site has been deleted, you can create a clone of your test site by following this guide Create a test site. In your case, the url of the clone will be club-choir.web.cern.ch.
Cheers,
Dimitra