I'll try to make a private mirror of this website, or at least the courses. The rest of the site is dynamic, so there is no much point in mirroring it. Then, if admin permits, I could upload the mirror somewhere.
EDIT : forget that! I didn't realise the whole site was dynamic so the mirroring failed!
The only solution is for admins to open source the site if they want to. In which case they could upload it to Github for example.