Below script backups the database and schedules it to 12.00AM
USE [msdb]
GO
DECLARE @jobId BINARY(16)
EXEC msdb.dbo.sp_add_job @job_name=N'Back Up Database - databaseName',
@enabled=1,
@notify_level_eventlog=0,
@notify_level_email=2,
@notify_level_netsend=2,
@notify_level_page=2,
@delete_level=0,
@category_name=N'[Uncategorized (Local)]',
@owner_login_name=N'sa', @job_id = @jobId OUTPUT
select @jobId
GO
EXEC msdb.dbo.sp_add_jobserver @job_name=N'Back Up Database - databaseName', @server_name = N'servername\instance'
GO
USE [msdb]
GO
EXEC msdb.dbo.sp_add_jobstep @job_name=N'Back Up Database - databaseName', @step_name=N'1',
@step_id=1,
@cmdexec_success_code=0,
@on_success_action=1,
@on_fail_action=2,
@retry_attempts=0,
@retry_interval=0,
@os_run_priority=0, @subsystem=N'TSQL',
@command=N'BACKUP DATABASE [DatabaseName] TO DISK = N''D:\DbFilepath\dbFileName.bak'' WITH NOFORMAT, NOINIT, NAME = N''Full Database Backup'', SKIP, NOREWIND, NOUNLOAD, STATS = 10
GO
',
@database_name=N'master',
@flags=0
GO
USE [msdb]
GO
EXEC msdb.dbo.sp_update_job @job_name=N'Back Up Database - databaseName',
@enabled=1,
@start_step_id=1,
@notify_level_eventlog=0,
@notify_level_email=2,
@notify_level_netsend=2,
@notify_level_page=2,
@delete_level=0,
@description=N'',
@category_name=N'[Uncategorized (Local)]',
@owner_login_name=N'sa',
@notify_email_operator_name=N'',
@notify_netsend_operator_name=N'',
@notify_page_operator_name=N''
GO
USE [msdb]
GO
DECLARE @schedule_id int
EXEC msdb.dbo.sp_add_jobschedule @job_name=N'Back Up Database - databaseName', @name=N'DailyBackup',
@enabled=1,
@freq_type=4,
@freq_interval=1,
@freq_subday_type=1,
@freq_subday_interval=0,
@freq_relative_interval=0,
@freq_recurrence_factor=1,
@active_start_date=20111024,
@active_end_date=99991231,
@active_start_time=0,
@active_end_time=235959, @schedule_id = @schedule_id OUTPUT
select @schedule_id
GO
change the values from the script
databaseName - database to backup
servername\instance - servername and sqlserver instance name
D:\DbFilepath\dbFileName.bak - backup file path