mariabackup command question (binlog backup)

Hi, I have mariadb 10.3.4-MariaDB, i trying to backup with mariabackup command.

i setup binlog in my.cnf root>cat /etc/my.cnf log_bin = /mariadb_data01/binlog/mariadb-binlog binlog_cache_size=100M max_binlog_size=200M expire_logs_days=4 binlog_format = mixed

And then, i trying to backup as below. after that backup has completed without any error. root>mariabackup --defaults-file="/etc/my.cnf" --backup --target-dir /mariadb_back/backup/ --user root --password xxxxx i checked backup folder but binlog folder did not found.

and i check binnary logs either enable or disabled. it was good MariaDB [(none)]> show binary logs; +-----------------------+-----------+ Log_name File_size +-----------------------+-----------+ mariadb-binlog.000001 666 mariadb-binlog.000002 370 mariadb-binlog.000003 370 mariadb-binlog.000004 523 mariadb-binlog.000005 347 +-----------------------+-----------+

and also check currnet binlog location. it was good. root>ls -al /mariadb_data01/binlog/ -rw-rw---- 1 mysql mysql 666 Feb 8 17:37 mariadb-binlog.000001 -rw-rw---- 1 mysql mysql 370 Feb 8 17:39 mariadb-binlog.000002 -rw-rw---- 1 mysql mysql 370 Feb 9 10:00 mariadb-binlog.000003 -rw-rw---- 1 mysql mysql 523 Feb 9 10:09 mariadb-binlog.000004 -rw-rw---- 1 mysql mysql 370 Feb 9 12:37 mariadb-binlog.000005 -rw-rw---- 1 mysql mysql 347 Feb 9 12:37 mariadb-binlog.000006 -rw-rw---- 1 mysql mysql 270 Feb 9 12:37 mariadb-binlog.index

Qustion: Therefore, How can i backup binlog folder with mariabackup command?