A long ago Battle Of The Planets episode had as part of the plot to steal the super secret defense plans.
They were on a audio tape.
Sad but funny.
To this day I think some Star Trek series should involve a spy who has learned to bypass security protocols by pulling up IBM 3270 Terminal Emulation, which affects all computers sufficiently influenced by Earth tech.
BTW, according to Harvey Birdman, Atty at Law, the Jetsons was set in the far off year 2002, meaning Grandpa Jetson would have been a young man when the show was first aired.