What to do with old NT server…?

I know this will sound pretty silly to some, –But please bear with me, I’m a hardware guy who recently got the role of network admin thrown in my lap! I’ve recently installed a new server at a client (about 20 users) of mine. I basically ghosted the NT4 server image off of the old, onto the new, and upgraded the new machine to 2003 standard. The whole install went seamlessly and is up and running. My question is…What can I do with the old server? It ran NT server for years and hardwarewise is a solid machine. All I would like the old machine to do is run the tape backup through a network share, run 1 or 2 simple 3rd party network programs, and that’s about it. Reinstalling the OS is not an issue.

Thank you, John.