xdmp:database-backup-purge( $dir as xs:string, $keep-num-backups as xs:unsignedInt, [$incremental-dir as xs:string] ) as empty-sequence()
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:database-backup-purge("/my/backupdir/", 10, "/my/incrementaldir") => ()
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