xdmp.databaseBackupPurge( dir as String, keep-num-backups as Number, [incremental-dir as String] ) as null
Purge old backups from a directory.
http://marklogic.com/xdmp/privileges/xdmp-database-backup-purge
http://marklogic.com/xdmp/privileges/xdmp-database-backup-purge/database/{id}
xdmp.databaseBackupPurge("/my/backupdir/", 10, "/my/incrementaldir"); => ()
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