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Subject: Re: [TUHS] PL/I stuff - was: Book Recommendation
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 > In my experience 9 track tapes were not guaranteed to be readable after
 > some interval.  In fact, a standard operations procedure was to copy
 > important tapes to new media periodically.

There are always ways in which your backups can go wrong and not be
readable, and I'm not arguing that here.

But 9 track tapes have turned out to be pretty spectacularly long-lived.
I've personally read tapes that were stored for 30+ years in
unconditioned spaces.

De