1. Redundancy is good. Cheap redundancy is usually better.
2. If you're giving away systems that have had sensitive data on them, you may want to go further than simply wiping the hard drives. In fact, the law may well require it. You may have to junk the drives entirely, and let the nonprofit pay for new drives (or swap in some drives that didn't have sensitive data on them). Hey -- at least the hardware was free.
3. Of course, such servers for Linux/Windows flame wars should be running FreeBSD or OpenSolaris, just to be fair (and because MS Windows would be terrible for servers on outdated hardware).
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