I want to have an offline server( ready to plug in to network) with the following software configured as the backup server :-

The existing domain server will have the below software installed & Configured
Windows 2003 std OS, ISA Server, MS Exchange 2003 in a PIV HP server with 144 GB RAID5.

I would like to know wheather I could keep one offline server detached from network with the same IP, Domain name & Server name and configured with all the mentioned software and with a Tape Backup. The purpose of this is to backup the data from the HP server everyday and keep it ready as standby server for the domain & Exchange. I know there are many issues regarding the login and policy changes but i would like to know any one came across with any kind of solutions for that.

Thanks