A system and method for controlling a backup operation to backup data from a source device to a backup storage device are described. For example, the ink stroke may be dynamically rendered as a stroke having uniform transparency while it is being drawn. Superimposed line sources can be used to generate narrowband ultrasounds. The first and second components include first and second passageways, respectively. A post clamping device holds the post during a time when other adjusting aspects of the present invention can be used to move a post up or down, from side to side in at least two directions, tipping in any direction and rotation about a vertical axis of the post.