OracleDB 19cでasmcmd md_backup -b ＜OCRバックアップファイル保存先（フルパス）＞を指定すると以下のような警告が出ます。（が、コマンド実行自体は出来るようです。）
「WARNING:option 'b' is deprecated for 'md_backup'」
以下日本語訳）
「警告: オプション 'b' は 'md_backup' では非推奨です」

[grid@rac19c-node1 tmp]$ asmcmd md_backup -b /tmp/test/ocr_backup
WARNING:option 'b' is deprecated for 'md_backup' --★
Disk group metadata to be backed up: CRS
Disk group metadata to be backed up: DATA
Disk group metadata to be backed up: RECO
Current alias directory path: ASM
Current alias directory path: rac19c-cluster/OCRFILE
Current alias directory path: ASM/PASSWORD
Current alias directory path: rac19c-cluster/OCRBACKUP
Current alias directory path: rac19c-cluster
Current alias directory path: rac19c-cluster/ASMPARAMETERFILE
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458/TEMPFILE
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458/DATAFILE
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/TEMPFILE
Current alias directory path: ASM
Current alias directory path: ORCL/ONLINELOG
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/DATAFILE
Current alias directory path: ORCL/TEMPFILE
Current alias directory path: ORCL/PASSWORD
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458
Current alias directory path: ASM/PARAMETERFILE
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312
Current alias directory path: ORCL
Current alias directory path: ORCL/DATAFILE
Current alias directory path: ORCL/CONTROLFILE
Current alias directory path: ORCL/PARAMETERFILE
Current alias directory path: ORCL/ARCHIVELOG/2024_11_30
Current alias directory path: ORCL/ARCHIVELOG/2024_12_04
Current alias directory path: ORCL/ARCHIVELOG/2024_10_18
Current alias directory path: ORCL/BACKUPSET/2024_03_05
Current alias directory path: ORCL/ARCHIVELOG/2024_10_21
Current alias directory path: ORCL/ARCHIVELOG/2024_11_13
Current alias directory path: ORCL/ARCHIVELOG/2024_11_27
Current alias directory path: ORCL
Current alias directory path: ORCL/ARCHIVELOG/2024_11_23
Current alias directory path: ORCL/ARCHIVELOG/2024_11_17
Current alias directory path: ORCL/ARCHIVELOG/test_aa
Current alias directory path: ORCL/ARCHIVELOG/2024_11_20
Current alias directory path: ORCL/ARCHIVELOG/2024_10_14
Current alias directory path: ORCL/ARCHIVELOG/2024_10_13
Current alias directory path: ORCL/ARCHIVELOG/2024_12_07
Current alias directory path: ORCL/ARCHIVELOG/2024_11_05
Current alias directory path: ORCL/ARCHIVELOG/2024_10_23
Current alias directory path: ORCL/ARCHIVELOG/2024_10_09
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/BACKUPSET/2024_10_10
Current alias directory path: ORCL/ARCHIVELOG/2024_11_01
Current alias directory path: ORCL/ARCHIVELOG/2024_10_15
Current alias directory path: ORCL/ARCHIVELOG/2024_10_30
Current alias directory path: ORCL/ARCHIVELOG/2024_10_27
Current alias directory path: ORCL/AUTOBACKUP
Current alias directory path: ORCL/ARCHIVELOG/2024_11_08
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458/BACKUPSET
Current alias directory path: ORCL/ARCHIVELOG/2024_12_02
Current alias directory path: ORCL/ARCHIVELOG/2024_11_24
Current alias directory path: ORCL/BACKUPSET/2022_04_17
Current alias directory path: DUMMY_FILES
Current alias directory path: ORCL/ARCHIVELOG/2024_11_22
Current alias directory path: ORCL/CONTROLFILE
Current alias directory path: ORCL/ARCHIVELOG/2024_10_26
Current alias directory path: ORCL/ARCHIVELOG/2024_11_14
Current alias directory path: ASM/BACKUPSET
Current alias directory path: ORCL/ARCHIVELOG/2024_11_11
Current alias directory path: ORCL/ARCHIVELOG/2024_11_09
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458
Current alias directory path: ORCL/ARCHIVELOG/2024_11_06
Current alias directory path: ORCL/ARCHIVELOG/2024_10_29
Current alias directory path: ORCL/ARCHIVELOG/2024_10_10
Current alias directory path: ORCL/ARCHIVELOG/2024_12_03
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/BACKUPSET
Current alias directory path: ORCL/ARCHIVELOG/2024_11_18
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312
Current alias directory path: ORCL/ARCHIVELOG/2024_10_17
Current alias directory path: ORCL/AUTOBACKUP/2024_10_10
Current alias directory path: ORCL/ARCHIVELOG/2024_12_01
Current alias directory path: ORCL/ARCHIVELOG/2024_11_29
Current alias directory path: ASM
Current alias directory path: ORCL/ARCHIVELOG/2024_11_15
Current alias directory path: ORCL/ARCHIVELOG/2024_11_02
Current alias directory path: ORCL/ARCHIVELOG/2024_11_26
Current alias directory path: ORCL/ARCHIVELOG
Current alias directory path: ORCL/ARCHIVELOG/2024_10_25
Current alias directory path: ORCL/ARCHIVELOG/2024_10_22
Current alias directory path: ORCL/ARCHIVELOG/2024_10_20
Current alias directory path: ORCL/ARCHIVELOG/2024_10_19
Current alias directory path: ORCL/ARCHIVELOG/2024_11_25
Current alias directory path: ORCL/ARCHIVELOG/2024_11_16
Current alias directory path: ORCL/ARCHIVELOG/2024_10_11
Current alias directory path: ORCL/ONLINELOG
Current alias directory path: ORCL/ARCHIVELOG/2024_11_28
Current alias directory path: ORCL/ARCHIVELOG/2024_10_16
Current alias directory path: ORCL/ARCHIVELOG/2024_11_12
Current alias directory path: ORCL/ARCHIVELOG/2024_11_04
Current alias directory path: ORCL/ARCHIVELOG/2024_11_21
Current alias directory path: ORCL/ARCHIVELOG/2024_11_19
Current alias directory path: ORCL/ARCHIVELOG/2024_10_12
Current alias directory path: ORCL/ARCHIVELOG/2024_11_03
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/BACKUPSET/2024_03_08
Current alias directory path: ORCL/ARCHIVELOG/2024_10_31
Current alias directory path: ORCL/ARCHIVELOG/2024_12_06
Current alias directory path: ORCL/BACKUPSET
Current alias directory path: ORCL/BACKUPSET/2024_10_10
Current alias directory path: ORCL/ARCHIVELOG/2024_10_28
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458/BACKUPSET/2024_10_10
Current alias directory path: ORCL/ARCHIVELOG/2024_10_24
Current alias directory path: ORCL/ARCHIVELOG/2024_11_10
Current alias directory path: ORCL/ARCHIVELOG/2024_12_08
Current alias directory path: ORCL/AUTOBACKUP/2024_03_08
Current alias directory path: ORCL/ARCHIVELOG/2024_12_05
Current alias directory path: ORCL/ARCHIVELOG/2024_11_07
Current alias directory path: ORCL/BACKUPSET/2024_03_08

「-b」無しでそのまま保存先を指定すれば問題ないようです。

[grid@rac19c-node1 test]$ asmcmd md_backup /tmp/test/ocr_backup2
Disk group metadata to be backed up: CRS
Disk group metadata to be backed up: DATA
Disk group metadata to be backed up: RECO
Current alias directory path: rac19c-cluster/OCRBACKUP
Current alias directory path: rac19c-cluster
Current alias directory path: rac19c-cluster/OCRFILE
Current alias directory path: rac19c-cluster/ASMPARAMETERFILE
Current alias directory path: ASM
Current alias directory path: ASM/PASSWORD
Current alias directory path: ORCL/CONTROLFILE
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458/TEMPFILE
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/DATAFILE
Current alias directory path: ORCL/DATAFILE
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/TEMPFILE
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458/DATAFILE
Current alias directory path: ASM/PARAMETERFILE
Current alias directory path: ORCL/ONLINELOG
Current alias directory path: ORCL
Current alias directory path: ORCL/PARAMETERFILE
Current alias directory path: ASM
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458
Current alias directory path: ORCL/TEMPFILE
Current alias directory path: ORCL/PASSWORD
Current alias directory path: ORCL/ARCHIVELOG/2024_12_07
Current alias directory path: ORCL/ARCHIVELOG/2024_11_05
Current alias directory path: ORCL/ARCHIVELOG/2024_10_23
Current alias directory path: ORCL/ARCHIVELOG/2024_10_09
Current alias directory path: ORCL/ARCHIVELOG/2024_10_15
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/BACKUPSET/2024_10_10
Current alias directory path: ORCL/ARCHIVELOG/2024_11_01
Current alias directory path: ORCL/ARCHIVELOG/2024_10_30
Current alias directory path: ORCL/ARCHIVELOG/2024_10_27
Current alias directory path: ORCL/AUTOBACKUP
Current alias directory path: ORCL/ARCHIVELOG/2024_11_08
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458/BACKUPSET
Current alias directory path: ORCL/ARCHIVELOG/2024_12_02
Current alias directory path: ORCL/ARCHIVELOG/2024_11_24
Current alias directory path: ORCL/BACKUPSET/2022_04_17
Current alias directory path: DUMMY_FILES
Current alias directory path: ORCL/CONTROLFILE
Current alias directory path: ORCL/ARCHIVELOG/2024_11_22
Current alias directory path: ORCL/ARCHIVELOG/2024_10_26
Current alias directory path: ORCL/ARCHIVELOG/2024_11_14
Current alias directory path: ASM/BACKUPSET
Current alias directory path: ORCL/ARCHIVELOG/2024_11_11
Current alias directory path: ORCL/ARCHIVELOG/2024_11_09
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458
Current alias directory path: ORCL/ARCHIVELOG/2024_11_06
Current alias directory path: ORCL/ARCHIVELOG/2024_10_10
Current alias directory path: ORCL/ARCHIVELOG/2024_10_29
Current alias directory path: ORCL/ARCHIVELOG/2024_12_03
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/BACKUPSET
Current alias directory path: ORCL/ARCHIVELOG/2024_12_04
Current alias directory path: ORCL/ARCHIVELOG/2024_11_30
Current alias directory path: ORCL/ARCHIVELOG/2024_10_18
Current alias directory path: ORCL/BACKUPSET/2024_03_05
Current alias directory path: ORCL/ARCHIVELOG/2024_10_21
Current alias directory path: ORCL/ARCHIVELOG/2024_11_13
Current alias directory path: ORCL/ARCHIVELOG/2024_11_27
Current alias directory path: ORCL
Current alias directory path: ORCL/ARCHIVELOG/2024_11_23
Current alias directory path: ORCL/ARCHIVELOG/2024_11_17
Current alias directory path: ORCL/ARCHIVELOG/test_aa
Current alias directory path: ORCL/ARCHIVELOG/2024_11_20
Current alias directory path: ORCL/ARCHIVELOG/2024_10_14
Current alias directory path: ORCL/ARCHIVELOG/2024_10_13
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312/BACKUPSET/2024_03_08
Current alias directory path: ORCL/ARCHIVELOG/2024_11_03
Current alias directory path: ORCL/ARCHIVELOG/2024_10_31
Current alias directory path: ORCL/ARCHIVELOG/2024_12_06
Current alias directory path: ORCL/BACKUPSET
Current alias directory path: ORCL/BACKUPSET/2024_10_10
Current alias directory path: ORCL/DCD0ACB55B6C6F3EE053B50BA8C0F458/BACKUPSET/2024_10_10
Current alias directory path: ORCL/ARCHIVELOG/2024_10_28
Current alias directory path: ORCL/ARCHIVELOG/2024_10_24
Current alias directory path: ORCL/ARCHIVELOG/2024_11_10
Current alias directory path: ORCL/ARCHIVELOG/2024_12_08
Current alias directory path: ORCL/AUTOBACKUP/2024_03_08
Current alias directory path: ORCL/ARCHIVELOG/2024_12_05
Current alias directory path: ORCL/BACKUPSET/2024_03_08
Current alias directory path: ORCL/ARCHIVELOG/2024_11_07
Current alias directory path: ORCL/ARCHIVELOG/2024_11_18
Current alias directory path: ORCL/DCD1758283791FCAE053B50BA8C0A312
Current alias directory path: ORCL/ARCHIVELOG/2024_10_17
Current alias directory path: ORCL/AUTOBACKUP/2024_10_10
Current alias directory path: ORCL/ARCHIVELOG/2024_12_01
Current alias directory path: ORCL/ARCHIVELOG/2024_11_29
Current alias directory path: ASM
Current alias directory path: ORCL/ARCHIVELOG/2024_11_02
Current alias directory path: ORCL/ARCHIVELOG/2024_11_15
Current alias directory path: ORCL/ARCHIVELOG/2024_11_26
Current alias directory path: ORCL/ARCHIVELOG
Current alias directory path: ORCL/ARCHIVELOG/2024_10_22
Current alias directory path: ORCL/ARCHIVELOG/2024_10_25
Current alias directory path: ORCL/ARCHIVELOG/2024_10_20
Current alias directory path: ORCL/ARCHIVELOG/2024_10_19
Current alias directory path: ORCL/ARCHIVELOG/2024_11_25
Current alias directory path: ORCL/ARCHIVELOG/2024_11_16
Current alias directory path: ORCL/ARCHIVELOG/2024_10_11
Current alias directory path: ORCL/ARCHIVELOG/2024_11_28
Current alias directory path: ORCL/ARCHIVELOG/2024_10_16
Current alias directory path: ORCL/ONLINELOG
Current alias directory path: ORCL/ARCHIVELOG/2024_11_12
Current alias directory path: ORCL/ARCHIVELOG/2024_11_04
Current alias directory path: ORCL/ARCHIVELOG/2024_11_21
Current alias directory path: ORCL/ARCHIVELOG/2024_11_19
Current alias directory path: ORCL/ARCHIVELOG/2024_10_12
[grid@rac19c-node1 test]$
[grid@rac19c-node1 test]$ ll
total 160
-rw-r--r-- 1 grid oinstall 78602 Dec  9 19:37 bk_ocr_backup
-rw-r--r-- 1 grid oinstall 78602 Dec  9 19:41 ocr_backup2