The server is currently down due to issues with the cloud hosting provider. The data has not been lost (worst case is several hours of rollback).
No ETA yet on when things will return to normal.
UPDATE: the issues are due to a mistake in our provider's billing. Simply put, they've charged us too much and suspended our account. They've already confirmed that they were wrong, so the server will be up once this issue has been resolved. Most likely, in 15 hours.
UPDATE 2: the server will be up at 12 PM GMT tomorrow (see comments for more info).