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"I share the view of Pythagoras that the world is number. The ultimate substrate of the universe is math. There's no way to test that - it's pure metaphysical speculation."
- Bart Kosko

Personal Cache  
  An online data repository used to store personal data.  

This is a rather novel idea; it is similar to the idea of a lifelog.

From her pocket she drew one of two data spools, inserting it into a slot in the counter. Picking a code word from the name of a college roommate's pet cat, she created a personal cache and fed in the contents of the spool. When the cylinder was empty and erased, she breathed a little easier.

...She'd just registered her story... If any of it ever did come to trial, now she'd be able to show with this dated cache that she had acted in good faith. The Rio treaties did allow one to withhold information temporarily - or try to - so long as careful records were maintained... never imagined that "temporary" might be interpreted to be as long as twenty years or that the registering of diaries like hers would become an industry in itself.

Teresa sealed the file, swallowing the key in her mind. Such was her faith in the system that she simply left the empty spool lying there on the countertop.

From Earth, by David Brin.
Published by Bantam in 1990
Additional resources -

The idea of a personal cache is also a predecessor to the free gigabyte storage offered by Internet firms like Yahoo and Google for use with their various applications (like email).

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Additional resources:
  More Ideas and Technology from Earth
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