Another thing;
There are many places to find backups of an entire search engine's contents. All it is, is a text file listing thousands of hashes. If you have magnet links set up properly, all one needs to do is paste the hash into the URL bar of a browser and the magnet link setup will automatically activate what needs to be activated in order for the download process to begin. It's almost like setting up an "open with..." dialog in Windows.
Any KAT or TPB mirror simply hosts those magnet links as if they were uploaded there, but it couldn't be further from the truth. It's nothing more than a reposting of a bunch of hashes with an elaborate web interface that mimics the original website.
Here's an example of one. If you're game, click it and see what it dos.