How to exclude MS SQL Databases from SQL Log backup

Challenge

It is necessary to exclude specific databases on one or multiple Microsoft SQL Server instances from Veeam SQL Log backup processing. 
 

Solution

In Veeam Backup & Replication 8.x and 9.x, registry keys need to be created, specifying which combination of Instance/DB to exclude 
 
All keys need to be created inside "HKEY_LOCAL_MACHINE\SOFTWARE\VeeaM\Veeam Backup and Replication", on the server Veeam Backup and Replication is installed on.

SqlBackupInstanceDatabaseDelimiter
         Type: REG_SZ
         value: ":"

SqlBackupInstanceDatabasePairsDelimiter
         Type: REG_SZ
         value: ";"

SqlBackupDatabasesToSkip
         Type: REG_SZ
         value: "mysqlserver_instance:mydb;mysqlserver_instance:mydb2"


To exclude SQL databases from SQL logs backups, list databases and instances as following, with multiple combinations possible:  
sql_instance_name:db_name - skip everything containing specified instance and db name 
sql_instance_name: - skip all databases on this instance 
:db_name - skip all databases with this name, on all instances