8 for me. In any case, the return value of GetKey is an ASCII code, not a scan code.
14 is indeed the Backspace key for my keyboard.
Try this code:
Time = MilliSecs()
While Not KeyHit(1)
Time = Time + 8
Repeat
Until MilliSecs() > Time
Text 2,2,"KeyDown(14) returned "+KeyDown(14)
Flip
Cls
Wend