Old Backup Tapes

We have a large number of old backup tapes. I quit seeking and counting
after 200. I am reasonably certain that at least some of the tapes
contain restricted data.

What are the least expensive ways to destroy the data (I assume that
will require destruction of the tapes), and have an audit trail for the
destruction, if that is necessary?

-- 
Jon Johnsen
Information Systems Office  
461 University Hall
School of Public Health, UC Berkeley
510 642 5030
 
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