If you are performing the backup of your database, and if you could see the statement in log with " XXX File(s) copied" without any errors during execution, then the database is copied successfully.
You can verify the database size in backup location that you have mentioned in dbutils.bat/sh file and the actual database in "<Storage manager installation directory>/mariadb/storage" directory.
If you face any errors during backing up your database, then please try to perform backup again.
If you are performing Maintenance on your database and if there are any errors you have faced during fixing the index (MYISAMCHK) of any crashed tables, please go through this link which provides you guidance on handling errors with Crashed tables.
SolarWinds Knowledge Base :: How to Run a myisamchk to Resolve Crashed MariaDB Tables