Sounds like a whole myriad of things . . . whatever it was, it seems they've emerged victorious from it, as the site is now back up and seems to be running pretty smoothly. Here's the last on-site update from Cori.
A multitude of things went wrong, but we believe we are back with 99.99732% of the content in all areas. Due to how we had to perform the recovery this time, it's possible a portion of things such as STEX uploads or attachments on exactly 30 Sept, 2018 might be missing and any posts, PMs, status updates, etc (but not STEX files & attachments) after 09:17 AM EDT on 05 Oct, 2018 will be missing. The site was briefly operational a few times after my full database backup on 05 Oct and posts, PMs, status updates, new member registrations, etc from there and after are lost.
We do apologize for any loss and the inconvenience of this whole mess.
-Alex