John's question lets Dr. Dave state an enduring preservation rule: an online service is useful but cannot be the only copy, especially when it is outside the owner's control. He builds a layered plan for archival and changing material and admits that drives themselves fail.
This excerpt runs from 2:47.426 to 6:46.270 within its preserved source recording.
Proposed recording date: 2009-04-18. The exact broadcast date may differ.
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