In some rare cases, if an empty backup has left by a failure during a backup, the cron could start trashin WAL files, as if there is no available backups.
--- old+++ new@@ -1,3 +1,3 @@-In some rare cases, if an empty backup has left by a failure in barman archive, the cron could begin to trash wal files, as if there is no available backups.+In some rare cases, if an empty backup has left by a failure during a backup, the cron could start trashin WAL files, as if there is no available backups.
Ref: https://groups.google.com/forum/#!topic/pgbarman/eN-NJghyi1s
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