mariabackup reporting of completed and failures includes no details

When the backup is running, it reports which file is going to be copied:

[01] 2021-07-01 07:39:29 Copying ./VMPTX_central/actlog#P#P202008.ibd to /backup/b4/VMPTX_central/actlog#P#P202008.ibd

But when the copying has completed, the details about which file has been completed are missing, which will be difficulty to trace if there are multiple paralell copying performed at the same time (which copying is "...done" ?):

[01] 2021-07-01 07:39:30 ...done

When backup has been completed with the status of failure, the FATAL error message does not include the name of the datafile that fails to be copied, nor any os error messages or return codes causing the failures:

[00] FATAL ERROR: 2021-07-01 08:05:47 failed to copy datafile.

The actual OS or MariaDB error details causing the copying to fail is not presented, even if --verbose flag has been used.