The second database server has been restored and no data has been lost
However, the data has not been imported into the system, and I'm not sure if that's a good ide since you may have deleted messages, changed the look of your guestbook and simply importing the data will overwrite changes that you have made since yesterday.
What I'll do is that I'll create a subdomain running the restored database so that you can take a look at your guestbook and see if any messages are missing. If that's the case I'll manually move the messages to the live server.
The recovered data will be available some time tomorrow afternoon (GMT).