code: def cli(env, volume_id, replicant_id):
      
      file_storage_manager = SoftLayer.FileStorageManager(env.client)
  
      success = file_storage_manager.failback_from_replicant(
          volume_id,
          replicant_id
      )
  
      if success:
          click.echo("Failback from replicant is now in progress.")
      else:
          click.echo("Failback operation could not be initiated.")
docs: Failback a file volume from the given replicant volume.