Yes, Power Pro is used for backing. You need to use at least 50 pound line and many use 65 pound. I would not use the 20 or 30 pound line because of its small diameter. Power Pro is fairly round and I don't have a problem with it getting buried in the spool. It makes a good backing because it is limp with little or no memory and it floats. It comes in a yellow and green color. Give it a try you might like it.
Power Pro is very slick and normal mono knots won't hold well. You will need to increase the number of wraps when tying a knot.