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Thanks Bitt. I was actually thinking about buying a readyNAS NAS server by Infrant. And this device also used RAID, that's why I was asking. I was also planning on using a separate external HD with it (it's got USB ports as well), for the extra backup, since I know RAID doesn't protect you from viruses etc.

All of the Infrant NAS units I've looked at actually run Linux software RAID and don't have an actual RAID controller. You can yank the drives and plug them into any Linux PC with the correct version software etc...