It ain't cheap at $799 US for the 80GB drive, but a Fortress combined with tape drive sounds like the ideal backup system for the rich and the paranoid.

From Features for Fortress: the ultimate USB 2.0 and Firewire Hard Drive:

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Shock Dampening: Patented Visco-Elastic Dynamic Dampening System

Shock Resistance: Drive assembly will withstand a non-operating impact from a drop-height of 72.00 inches (1.83 metres) onto concrete.

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