AIJ modify operation not allowed; AIJ backup in progress

  Explanation:  An AIJ backup is currently in progress.  While an
  AIJ backup is in progress, AIJ modify operations (such as,
  disabling AIJ journaling or changing the default AIJ filename)
  are not permitted.  If the AIJ backup was prematurely terminated
  by the user, another AIJ backup must complete before AIJ
  modifications are permitted.

  User Action:  Allow the AIJ backup to finish before attempting
  the AIJ modify operation.  If the AIJ backup was prematurely
  terminated by the user, start another AIJ backup and allow it to
  complete.  The AIJ modify operation will then be possible.