3.13.2 (2025-03-27)

Minor changes

• Fix errors when using an immutable storage

  Added a new worm_mode configuration to enable WORM (Write Once Read Many)
  handling in Barman, allowing it to support backups on immutable storage.

  This fix also provides automatic relocation of the backup.info file in a new
  directory meta inside backup_directory. This will let Barman update it
  in future when needed.

  Barman will also not purge the wals directory for WAL files that are not
  needed when running the first backup. This will add some extra space
  which will be reclaimed when this first backup is obsolete and removed
  (by that time, the backups and the WALs will be outside the retention
  policy window).

  Added additional notes to the documentation explaining limitations when
  running with an immutable storage for backups. In particular the need
  for a grace period in the immutability of files and the fact that
  barman keep is not supported in these environments.

  References: BAR-649, BAR-645, BAR-650, BAR-651, BAR-652.