The ornamental design for a basketballbackboard, as shown and described.
FIG. 1 is a front elevational view of a basketball backboard lined for
color and having a number of seamlike markings;
FIG. 2 is a side elevational view of the backboard shown in FIG. 1 with a
basketball goal shown in broken lines for illustrative purposes only;
FIG. 3 is a front elevational view of a basketball backboard wherein the
seamlike markings have been repositioned;
FIG. 4 is a front elevational view of another embodiment of my design of a
basketball backboard where the seamlike markings have been repositioned
and the backboard material comprises a clear material.