Decouple site component backup service from database server
Configuration Manager currently installs binaries and configures the SQL backup site component service on the database server, running under LocalSystem authority. Many environments have separate groups that host and manage the SQL Server enterprise environment, and do not allow for services or additional software to be installed on them, creating unnecessary conflict and drama when SCCM needs to be installed. SQL Server is a networked service, there shouldn't be a reason to install software on the database server running under a privileged account in order to leverage backup routines.
Robert Marshall - EM MVP commented
Importantly, ConfigMgr backups of the database are not the preferred route to take anymore. Instead, SQL server itself now performs ConfigMgr backups, liberating the need to install ConfigMgr backup related components onto a SQL server\cluster to do this.