I am attempting to backup the transaction logs of master, model in addition to the msdb.
MSDB transaction log backs up without any issues, but the master and model do not.
Here is the script that I have included in a new Agent job (copied from DatabaseBackup - System_Database - Full) which I have named DatabaseBackup - System_Database - Log.
sqlcmd -E -S $(ESCAPE_SQUOTE(SRVR)) -d master -Q "EXECUTE [dbo].[DatabaseBackup] @Databases = 'SYSTEM_DATABASES', @Directory = N'\\synologymb\sql backups' , @BackupType = 'LOG', @Verify = 'Y', @CleanupTime = 24, @CheckSum = 'Y', @LogToTable = 'Y'" -b