Glenn Berry makes some recommendations:
Does making your SQL Server database backups twice as fast sound interesting? SQL Server 2022 has new options to help you improve SQL Server database backup performance. If you are on an older version of SQL Server, you still have options for Improving SQL Server Database Backup Performance.
In order to improve your database backup performance, you need to understand what is happening during a database backup and what your bottleneck(s) are.
Read on for an overview of the key considerations.