Backspin can have a major impact on the distance of your drives, along with a handful of other factors. If you have a slower swing speed, you need more backspin to get the ball airborne, but if you have a higher swing speed you need a lower backspin rate to ensure the ball won’t ‘balloon’.
When your clubface makes contact with the ball, the ball is going to roll up the clubface…hence the creation of backspin. The creation of backspin creates lift for the ball but it can create too much spin which will cause a loss of distance on your drives. The combination of loft and launch angle needs to be taken into account when it comes to backspin and distance.