What is seeding?
Seeding is where you leave your BitTorrent client open after you've finished your download to help distribute it (you distribute the file while downloading, but it's even more helpful if you continue to distribute the full file even after you have finished downloading). Chances are that most of the data you got was from seeds, so help give back to the community! It doesn't require much - the client will continue seeding until the torrent is removed (right click the torrent, then hit Remove). Proper practice is to seed until the ratio of upload:download is at least 1.00.