Doug writes:

The key is REDUNDANCY. Lets say computer one has a probability of
breaking of .01 (1 out of 100). Computer B has a probability of
breaking of .01. If their probabilities of breaking are independent of
each other then the probability of BOTH breaking is .0001 (1 in
10,000).

The problem is common-mode failures. If one computer has a software
bug, the other one will have it, too, unless the two computers contain
different software. So just duplicating parts won't necessarily help.
You just end up with two G1000's rebooting instead of one.

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