What's wrong with the easily available SATA? Don't tell me you still want IDE/EIDE? Got something readily available that is faster and on most easily obtainable motherboards AND isn't SCSI (otherwise known as the devil's work)?
SCSI is just one big pain in the ARS. Boots too slow and size is a problem unless you want to spend mucho buckos. The only thing that makes it attractive is speed when moving very large files. Unless you do that a lot, you won't notice much if any funtional difference.
RAID is useful and easy to set up since it comes with many low cost, but not cheap, motherboards. However, if there is another automatic backup system, that doesn't require you to change tapes in and out, for instance, then I'd like to hear of it. (Really, I would! I want to put that into my next home-brew.) Of course, to be useful, it has to be something available on a Mac system (which I don't think he's building), unix, or windows. And yes, I know, windows sux.
What exactly is wrong with mirroring? It may not be a speedy thing but it gives you an instant replacement drive if the first fails. And with the cost of drives these days, it's easy to get a replacement. Just make sure you buy a popular and quality drive when you start.
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