I know, i did the numbers too - but it's still an almost unthinkable amount of data to try and make sense of. If we conservatively say that there are 5 others like linx, that's nearly half a million 3TB drives. And that's only for 3 days!
edit: clarity
> but it's still an almost unthinkable amount of data to try and make sense of.
It's only money, and compared with keeping a division supplied in Afghanistan or putting an enormous reconnaissance satellite in space, it's an obvious winner in the minds of the people running the security apparatus.