Preheat oven at 350.Combine crushed crackers and butter in a bowl. Press into the bottom of a greased springform pan. I use 9 in springform pan. Place on a cookie sheet. Bake at 350 for 10 minutes. Cool on a wire rack. Lower oven to 325.
Beat cream cheese and 1/4 cup of sour cream until smooth. Add eggs and beat until combined. Add the onion, lemon juice, seafood seasoning, hot sauce, and pepper. Beat until blended. Fold in the crab meat.
Bake for 35-40 minutes or until center is almost set. Cool for 10 minutes. Carefully loosen with a knife. Coole for 1 hour. Spread with 1/2 cup of sour cream. Refrigerate overnight. Remove pan sides.
Bring to room temperature for about 30 minutes before serving.
Serve with crackers or sourdough baguette slices.