Hi, I currenlty use ARCserve to back up my 46Gb Exchange 2003 server on Windows Server 2003. For belt and braces purposes I am now wanting to also use ntbackup to take an extra backup to disk overnight. I do not have any experince of ntback with Exchange 2003. I wondered if I can run a hot backup ok whilst keeping the server up and running?

Well, no need to do 2 backups, though maybe with ArcServe you have a point. :P Yes,, you can do an online backup: http://www.msexchange.org/tutorials/exchange-2003-backup-restore-ntbackup.html