Backup
I'm not sure if they offer an unlimited bandwidth vps package but if they do then you should be running an automated backup at least once a week !
I had the same thing happen to me and was backing up the entire Vps every other day. Downtime about 12 hours including phoning every customers and backing up their locally cached email that was outside of the backup window. All I lost was some server logs and sales that may have happened in the downtime. Needless to say the backup is now daily.....