On the Super Admin's "Sites" page, each site has the following options:
Edit | Dashboard | Deactivate | Archive | Spam | Delete | Visit
What do Deactivate and Archive really do?
(I am interested in whether I can take some sites out of commission, in so far as not weighing down the network, being subject to any plugin processes, database queries etc, without fully deleting them. Maybe deactivate and archive won't satisfy that, but I'd still like to know what they really do).