One large RAID 6 or Two smaller RAID 5 arrays

Which RAID setup for a poor backup client?

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I have a client that is very very poor at backups, and while I preach that RAID is NOT a backup solution, his just might be some of the time. I can set him up two 4 disk RAID 5 systems that are mirrored, or one RAID 6 with two hot disks. Which way to go?