Mail is pretty much safe for the moment. We have two complete backups of mail stored on different systems. We're getting some errors while performing our initial backup of user data, but we're hoping that these errors are only temporary (ie., they'll be solved when we fsck the file system).
Some users have requested an ETA, and, for the moment, it seems the earliest the OCF will be back up and in working order is this weekend. No guarantees, though. Although we know how important it is for our users to have access to their mail, data, and web services, we're trying to take our time and do everything right so no user data is lost. If there are any special circumstances or issues that you believe we should be aware of, please visit our IRC channel (#ocf on irc.ocf.berkeley.edu).