Just to let you know, today's crash happened because the (physical) server mysteriously crashed, according to our hoster. Apparently, they still don't know what went wrong.
Either way, the consequences shouldn't be any worse than any "ordinary" rollback (which, thankfully, are also rather rare these days). Some of you Hearthlings may know this as the kind of event that nuked many map areas in Haven, but thanks to the auto-backup function I added after the last such event, that was avoided now.