In every stroke there are a few key technical elements that cannot be ignored. Here are the technical aspects that every solid one-handed topspin backhand shares:
Eastern Backhand Grip
Footwork: Try to step into the shot
Backswing: Use the non-dominant hand, use the torso, keep the hitting arm fairly straight, drop the racquet head below the ball.
Forward swing: swing low to high, swing inside out, separate your hands.
Contact point: Make contact in front of the body keeping your body sideways.
Follow through: Finish sideways with the racquet head high.