RAID 1 vs data corruption

I am completely paranoid about backing up my data. I have a NAS server with a pair of hard drives in a RAID 1 array. I use software RAID to be independent of the hardware and I monitor the SMART reports of my drives regularly. So I thought that I was doing everything right and therefore that my NAS was bulletproof. But with three of my drives failing in the past 5 months, I started to question that assumption. So far I have been lucky that I never had two drives fail at the same time. I knew this was a risk but it seemed very unlikely. Now I am not so sure.

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