I can answer part of that, Pioneer. There has been time slips before where the site has jumped back a few hours. Fortunately only twice that I recall, and never anything on this scale! But most games were sorted by good sportsmanship. Either replayed or resigned by the original loser.
Speaking for myself, I can't remember all games I lost or won, and would ask my opponents if I lost the game and don't resign, please remind me!
Of course people will be dismayed, but it goes without saying that Liquid and Fencer did everything possible before deciding to put us back online with so much data lost. It can't be helped and so far everyone has been fantastic about it. I'm proud to be part of such a wonderful site with great people.