The database server was acting up and not letting me do backups properly (after I migrated to the new disk array). I thought a reboot may help, but a reboot kind of killed it altogether and it wouldn't boot any more.
I'm now doing a reinstall, then will re-attach the database, then will boot it up again and hopefully it works without any data loss.
But for now NoobMeter is down and the most optimistic scenario has it back up in about 1 hour. The most pessimistic is a lot worse.
Sorry about this.
Edit - And it's back and it only took about 40 minutes. But I may have to retry the exercise at some other time as it's still not behaving properly.