on the topic of a wiki, what if we built a bot (or maybe there is one already that performs similar functions) that if we @ the bot or tag "wiki" in a comment or something, it adds the message content to a wiki page? seems less blatantly against TOS and allows us to retain useful content. probably slightly less useful than a full archive (e.g. maybe no one reading thinks XYZ is useful and doesn't tag it, but if you had been able to search for it with keywords it would have helped you 6 months later) but doesn't require any major costs/migration/etc.