journal <str> is busy and cannot be backed up

  Explanation:  An attempt has been made to back up an after-image
  journal  that  is  currently required for process recovery.  The
  journal is considered to be "busy" until no process requires the
  journal for recovery.

  User Action:  Use the /WAIT command qualifier to  indicate  that
  the  after-image  backup  is to "wait" for the journal to become
  available; that is, the journal  becomes  available  for  backup
  when no more processes require it for recovery.