Which SQL Server/Windows logins require the sysadmin role? I'm setting up a new SQL Server instance. Which of these SQL Server/Windows logins should have the sysadmin role?


NT AUTHORITY\SYSTEM 
NT SERVICE\SQLWriter 
NT SERVICE\Winmgmt 
NT SERVICE\MSSQLSERVER 
NT SERVICE\SQLSERVERAGENT
I'm not sure about NT AUTHORITY\SYSTEM. But according to the SQL Server documentation the others are added to the sysadmin role by SQL Server Setup, so I'm guessing it is required.

https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions?view=sql-server-2016#DE_Prov