 The SSTV signal was recorded on telemetry data tapes mostly as a backup in case the real-time conversion and broadcast around the world failed.Since the real-time broadcast conversion worked, and was widely recorded on both videotape and film, the backup video was not deemed important at the time.In the early 1980s, NASA's Landsat program was facing a severe data tape shortage and it is likely that during this period the tapes were erased and reused.