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You must be super unlucky to have 2 drives fail at the same time.........
RAID 6 is a must if you do 4+ drives....
It's not about luck, it's about preparedness.
RAID itself is not a backup solution, but a deterent.
On a local dell server here with 24TB (8x4TB) we use RAID 6 and have had 2 drives fail at very close proximity (think hours in between) and you better be prepared to pop in a replacement drive into the array very quickly (which take hours to repair, and you might even lose another drive during this process). Even if you're using Enterprise HDDs, things can go awry.
If you use 4 drives and below, RAID 5 is ok imo.
Most high end servers with exception to critical data use RAID 10