Ok, here's an update.
Sorry for the delay. There are backups, but they're unusable. The site went down due to DDOS attacks to the hosting provider. They've been struggling to sort that out for the past couple of days, hence the delay to get things back up. Now our site is back up, but some users lost their accounts. I don't yet know how many, nor if this is permanent or not.
I'm going to spend some time now to try and sort this out and somehow repair the DB. If that doesn't work, we're going to have to rely on some users to create new accounts, and compensate them for the loss of stats somehow.
I'm sorry about this, but it seems this is the hand we've been dealt.
Going to move this thread to the support forum for now.