Over at HerdingCats, there's a posting about the various ways you can think about and employ redundancy in systems design.
As a former Director of System Engineering, I certainly lend my endorsement to what was written, reproduced here as wrought there. [Disclosure: I don't agree with some of the stabs at Agile, but I certainly would add a spear re "no estimates"]
Here's the opening proposition, as posed by HerdingCats:
Redundancy provides resiliency to the system to withstand disruption within acceptable degradation parameters and to recover within an acceptable time and composite costs and risks
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