Those 3 wikis are unaccessible and unmaintained for years, and they are not supposed to contain anything that really worth keeping.
So I propose to simply get rid of them. I know we vaguely discussed backing them up, but it was a long time ago and nothing happened, if someone really wants to back them up then be my guest, but I don’t see the point of keep saying “we should back them up” and never do it.
Here is my +1.