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RAID arrarys are more about uptime than data security. It's not necessary. One drive in a USB enclosure will do, plus a second in another box (elsewhere on the local network, offsite, or even living in a closet) if you're paranoid of if the data you're backing up is very important.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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