How to backup TDE keystore from ASM to external location

Hi

Oracle 19.9

My question is, how to backup TDE keystore that resides in ASM...?

I have tried this, but it gives an error. And when reading about this error, it clearly says that I cannot backup keystore from ASM to OS location.

SQL> administer key management backup keystore using 'bkp1' force keystore identified by "supersecretpass" to '/home/oracle';
--ORA-46620: backup for the keystore cannot be taken

So I tried this instead, it does work, but the problem, this file still resides in ASM - the whole idea of backup is to make sure this file does need to be somewhere else, I mean, what if the ASM disks fails etc, then I need to be able to restore this file from external location.