  Yep, you can pull up things off the hard drive that were deleted years ago. It's expensive to do though and doesn't always work.  If I see the police at my door im going to rip out the HDD and set fire to the inside, should only take 3 min, I doubt the police would knock my door down that fast. The reason, well I dont want them knowing that I post on stormfront, and they would probably spend hours looking for a post that would insight racial hatred