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Just remember that you can't use the full 4 x 250Gb capacity with RAID1 or RAID5...
RAID0 - 1Tb total capacity but NO redundancy at all. If even one of the drives fail, you'll lose ALL your data, because it's striped (each tiny block of data is spread over multiple drives)
RAID1 - 500Gb total capacity with redundancy. (Effectively a 500Gb drive that is mirrored. It's probably also striped too.) One drive can fail without losing data, and a further one can fail without data loss if it's from the opposite "side"
RAID5 - 750Gb total capacity with redundancy. One drive can fail without losing data.
With both RAID1 and RAID5 the device should seamlessly be able to rebuild the array once you replace the drive.
The only prob I see with building arrays is that replacement drives may be difficult to obtain in the future. What happens if the first failure is in 5 years time, when the smallest drive you can buy is 700Gb?
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