basebackup_to_shell adds a custom basebackup target
  called shell. This makes it possible to run
  pg_basebackup --target=shell or, depending on how this
  module is configured,
  pg_basebackup --target=shell:,
  and cause a server command chosen by the server administrator to be executed
  for each tar archive generated by the backup process. The command will receive
  the contents of the archive via standard input.
 DETAIL_STRING
This module is primarily intended as an example of how to create a new backup targets via an extension module, but in some scenarios it may be useful for its own sake. In order to function, this module must be loaded via shared_preload_libraries or local_preload_libraries.
basebackup_to_shell.command (string)
     
    
      The command which the server should execute for each archive generated
      by the backup process. If %f occurs in the command
      string, it will be replaced by the name of the archive (e.g.
      base.tar). If %d occurs in the
      command string, it will be replaced by the target detail provided by
      the user. A target detail is required if %d is
      used in the command string, and prohibited otherwise. For security
      reasons, it may contain only alphanumeric characters. If
      %% occurs in the command string, it will be replaced
      by a single %. If % occurs in
      the command string followed by any other character or at the end of the
      string, an error occurs.
     
basebackup_to_shell.required_role (string)
     
    
      The role required in order to make use of the shell
      backup target. If this is not set, any replication user may make use of
      the shell backup target.
     
   Robert Haas <rhaas@postgresql.org>