从ASM磁盘Copy归档日志至文件系统:
SQL> set linesize 200 pagesize 200
SQL> col name for a80
SQL> select 'copy archivelog '''||name||''' to '''||'/tmp/rmanbak'||substr(name,instr(name,'/',-1,1),length(name))||''';' from v$archived_log where name is not null;

'COPYARCHIVELOG'''||NAME||'''TO'''||'/TMP/RMANBAK'||SUBSTR(NAME,INSTR(NAME,'/',-1,1),LENGTH(NAME))||''';'
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copy archivelog '+FRA/mydb/archivelog/2022_01_05/thread_1_seq_103.291.1093198059' to '/tmp/rmanbak/thread_1_seq_103.291.1093198059';
copy archivelog '+FRA/mydb/archivelog/2022_01_05/thread_2_seq_37.292.1093198063' to '/tmp/rmanbak/thread_2_seq_37.292.1093198063';
copy archivelog '+FRA/mydb/archivelog/2022_01_05/thread_1_seq_104.289.1093198125' to '/tmp/rmanbak/thread_1_seq_104.289.1093198125';
copy archivelog '+FRA/mydb/archivelog/2022_01_05/thread_2_seq_38.290.1093198125' to '/tmp/rmanbak/thread_2_seq_38.290.1093198125';

然后通过RMAN执行copy命令复制归档日志至文件系统:
[oracle@server01 ~]$ rman target /
RMAN> copy archivelog '+FRA/mydb/archivelog/2022_01_05/thread_2_seq_38.290.1093198125' to '/tmp/rmanbak/thread_2_seq_38.290.1093198125';