script for T-log mp job

Script to provide the default backup path (need to append \<DBNAME> and create the folder)

declare @BackupDirectory varchar(500)
declare @instanceName varchar(25) = cast((SELECT SERVERPROPERTY('InstanceName')) as nvarchar)
If @instanceName is null
begin
       DECLARE @HkeyLocal nvarchar(18)
       DECLARE @MSSqlServerRegPath nvarchar(31)
       DECLARE @InstanceRegPath sysname
       SELECT @HkeyLocal=N'HKEY_LOCAL_MACHINE'
       SELECT @MSSqlServerRegPath=N'SOFTWARE\Microsoft\MSSQLServer'
       SELECT @InstanceRegPath=@MSSqlServerRegPath + N'\MSSQLServer'
       EXEC master.dbo.xp_instance_regread @HkeyLocal, @InstanceRegPath, N'BackupDirectory', @BackupDirectory OUTPUT
end
       else   
begin
       declare @dir nvarchar(4000)
       declare       @key nvarchar(1000)
       declare       @instanceDir nvarchar(4000)
       exec master.sys.xp_regread 'HKEY_LOCAL_MACHINE', 'SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL', @instanceName, @instanceDir output, 'no_output'
       SET @key = N'Software\Microsoft\Microsoft SQL Server\' + RTRIM(@instanceDir) + '\MSSQLServer'
       exec master.sys.xp_regread 'HKEY_LOCAL_MACHINE',@key,@value_name='BackupDirectory',@value=@BackupDirectory OUTPUT
end
select @BackupDirectory


Backup job creation script

USE [msdb]
GO

BEGIN TRANSACTION
DECLARE @ReturnCode INT
SELECT @ReturnCode = 0
IF NOT EXISTS (SELECT name FROM msdb.dbo.syscategories WHERE name=N'Database Maintenance' AND category_class=1)
BEGIN
EXEC @ReturnCode = msdb.dbo.sp_add_category @class=N'JOB', @type=N'LOCAL', @name=N'Database Maintenance'
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback

END

DECLARE @jobId BINARY(16)
EXEC @ReturnCode =  msdb.dbo.sp_add_job @job_name=N'<DBNAME> TLog Backup', 
              @enabled=1, 
              @notify_level_eventlog=2, 
              @notify_level_email=0, 
              @notify_level_netsend=0, 
              @notify_level_page=0, 
              @delete_level=0, 
              @description=N'No description available.', 
              @category_name=N'Database Maintenance', 
              @owner_login_name=N'sa', @job_id = @jobId OUTPUT
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback

EXEC @ReturnCode = msdb.dbo.sp_add_jobstep @job_id=@jobId, @step_name=N'Subplan_1', 
              @step_id=1, 
              @cmdexec_success_code=0, 
              @on_success_action=1, 
              @on_success_step_id=0, 
              @on_fail_action=2, 
              @on_fail_step_id=0, 
              @retry_attempts=2, 
              @retry_interval=5, 
              @os_run_priority=0, @subsystem=N'TSQL', 
              @command=N'Declare @Current_Time varchar(20)
Set @Current_Time = (select replace(replace(replace(convert(varchar(50), getdate(), 120),''-'',''''),'' '',''_''),'':'',''''))
Declare @BackupLocation Varchar(250)
Set @BackupLocation = (''F:\Backup\MSSQL\MSSQL11.I01\MSSQL\Backup\<DBNAME>\<DBNAME>_''+@Current_Time+''.trn'')

If (select COUNT(*) from sys.databases
where name like ''<DBNAME>'' and state_desc like ''ONLINE'' and user_access_desc like ''MULTI_USER'' and is_read_only = 0 and recovery_model_desc not like ''SIMPLE''
and name not in (select primary_database from msdb.dbo.log_shipping_monitor_primary)) < 1
Begin
exec msdb.dbo.sp_stop_job @job_name = ''MP-<DBNAME> TLog Backup''

End
Else
Begin
BACKUP LOG [<DBNAME>] To Disk = @BackupLocation
End
', 
              @database_name=N'master', 
              @flags=0
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_update_job @job_id = @jobId, @start_step_id = 1
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_add_jobschedule @job_id=@jobId, @name=N'Run Database Task', 
              @enabled=1, 
              @freq_type=4, 
              @freq_interval=1, 
              @freq_subday_type=4, 
              @freq_subday_interval=15, 
              @freq_relative_interval=0, 
              @freq_recurrence_factor=0, 
              @active_start_date=20151015, 
              @active_end_date=99991231, 
              @active_start_time=0, 
              @active_end_time=235959
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_add_jobserver @job_id = @jobId, @server_name = N'(local)'
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
COMMIT TRANSACTION
GOTO EndSave
QuitWithRollback:
    IF (@@TRANCOUNT > 0) ROLLBACK TRANSACTION
EndSave:

GO