A player with a good slice backhand can cause a lot of frustration, especially in rallies from the baseline. The shot has less pace, bounces low, and it is difficult to change the direction of the shot due to the spin.
A great strategy against players with a good slice backhand is to move forward and make the player pass you with that shot. Try approaching to the player's backhand and also direct most of your volleys to that side of the court. This idea can be used in both singles and doubles and puts a lot of pressure on the opponent to keep the slice low.
Remember to focus on the point of contact on your volley and do not try to add pace to the shot-think more about the direction and make them pass you with their slice. Most players will not be able to hit that shot with the same decisiveness if you are at the net, and this should cause a lot of errors on their end or easy volleys for you.