5+ years ago I setup RAID on my home office Win 2003 server. I thought RAID would be a good safeguard - basically I thought it would be quick recovery in most cases, and thus sufficient when supplemented by occasional backups to other disk drives and external hard drives.
Turns out I was wrong. RAID crashes can be more difficult to recover from than a simple disk crash. Typically you can use a data recovery tool to extract data from a failing single disk drive. It can become more complicated to recover data when RAID is involved.
I now think RAID is not at all appropriate on a home, home office, small biz machine. It's just more complicated and expensive and confusing. Simpler is an online or Home Server like backup. You definitely need the automatic daily backup, cause once you don't backup for a month (or 6) and lose a months worth or data/work, the cost to recover instantly becomes $100's/$1000's when you count your lost time.
I recently signed up for Carbonite, which is like Mozy(Home). Seems to work well, though it takes a long time for the initial backup of only 15GB or so. Remote Access is a nice feature. At $35/yr, the price is right.
HomeServer might be a better option though. I'm just looking at it now after your article. Online/offsite seems like a nice no-worry, no power, no hardware option. But I imagine Home Server is faster and simpler, though not offsite, and it covers all computers, not just one. Carbonite is basically $35 to $50 per year for each computer.
So boo to RAID. Yes to Carbonite and probably yes to Home Server, though I'd need more of a pro/con list to choose between the Carbonite/MozyHome online option and the Home Server in your house option ...