I made sure to screenshot all my characters and save all my .costume files. (I had more costume files than characters, actually).
In fact, I spent the last couple of days saving the final versions of of my favorite characters' costumes. (Sometimes all I had saved was their initial costumes; sometimes I already had the final costume saved, but I made another copy just to be on the safe side - they're small enough). I e-mailed myself some copies so I'd have them in my Yahoo and Gmail boxes.
Yeah, if the game comes back with no data, I can literally recreate my characters' appearances in seconds. (Well, except for having to re-earn the auras and sometimes capes)
... I will miss the one-shoulder cape option.