LONDON (BTG):Backstreet Boys’ Howie Dorough has warned One Direction to keep its feet on the ground if they want their careers in the music industry to last. Backstreet Boys Howie, Nick Carter, Brian Littrell, AJ McLean and Kevin Richardson have been making music together since 1993 with a few breaks to pursue solo careers and are currently touring the UK. Howie told the Daily Star: “One Direction remind me so much of us back in the day, all that mania. “It’s a marathon, not a sprint so pace you so you don’t burn out too quickly.