The ornamental design for an archedbackingstrip for magnetic clip, as shown and described.
FIG. 1 is a perspective view of an arched backing strip in use with a magnetic clip.
FIG. 2 is a perspective view of the arched backing strip of FIG. 1.
FIG. 3 is a top view of the arched backing strip of FIG. 1.
FIG. 4 is bottom view of the arched backing strip of FIG. 1.
FIG. 5 is a first side view of the arched backing strip of FIG. 1, the second side view being a mirror of the first side view; and,
FIG. 6 is a first end view of the arched backing strip of FIG. 1, the second end view being a mirror of the first end view.
The stippling shown on the drawing represents a textured surface. The broken line depictions of the magnetic clip and flower in FIG. 1 form no part of the claimed design. The arched backing strip is shown with a symbolic break in its length. The appearance of any portion of the strip between the break lines forms no part of the claimed design.