So I restored from backup

Since there's no WiFi sync for iOS 4.2.1 on my iPod Touch, I realized that eventually I need to connect to iTune to do sync, so I might as well do it now.  And then I was thinking, maybe I'll just give it a shot and see what the backup restore brings me.  Well, the backup restore gave me back my game status for the games I was playing so far, like PacMan Champion Edition and Space Invader Infinite, but I also lost some setting that I set up a while ago.  Well, give and take I guess.