Someone who seeks information for information sake, for processing, manipulation, storage, reporting, simply to ensure that it is available when asked for (or simply to claim to have it, useful or otherwise). Named after Tony Hoare, was a pioneer in programming and data processing (he created the Quicksort algorithm).
SysAdmin: Which logs do you need from my servers?
SecDude: All of them
SysAdmin: You don't need *all* of them, do you?
SecDude: I might . . .
SysAdmin: You're such an information hoare.