Storage Technology, for one, markets tape cartridge silos which hold
something like 6,000 cartridges. The cartridges are picked by a
robot. Multiple of these silos can be linked, automating access to
terabytes of data.
Here's the idea. Store every logical data volume (one tape's worth of
data) redundantly on five cartridges. Annually, or so, and
automatically, compare each set of five cartridges. If four
cartridges are found to be identical and one different, throw out the
one and make a new one that matches the four good ones. Similarly, if
three cartridges agree and the other two are different, and different
from each other, replace the two. If more than two cartridges are
found discrepant, a human evaluates the situation. Collect statistics
regarding the situations where human intervention was required and,
using this data, refine the method.
Maintain two of these libraries, geographically dispersed.
If storage technology advances, consider a format change.
Using this method, and with adequate intent of stewardship, there is
some high probability that the collection would be maintained,
pristine, notwithstanding the volatility of the media.
Thanks for the brain cycles.
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