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Windows 2003 SMS Premium R2Sorry- that should have been SBS!
Another alternative is to split the server roles into a pair or more of VM's hosted on alternate hardware platforms to get some future expansion headroom and get away from SBS's single point of failure.
allow two instances when in a MS based VM server.I think that may apply to 2008 or newer- never heard about that with 2003. The first license is OEM, so can't transfer it away from the initial HW.
disaster recovery...Yes, all parts of the master plan.