If you're looking for redundancy, then RAID 1 is the one you want. The reason is because in RAID 1, the data is mirrored across every disk in the array, so as long as one disk is alright, then your data is safe.
RAID 0, on the other hand, doesn't provide any kind of redundancy. In RAID 0, data is distributed across several disks, resulting in greater speed, but this also means if even just one of the disks in the array fails, all data in all disks will also be lost.
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