BACKUP DATABASE { database_name | @database_name_var }
  TO <backup_device> [ ,...n ]
  [ <MIRROR TO clause> ] [ next-mirror-to ]
  [ WITH { DIFFERENTIAL | <general_WITH_options> [ ,...n ] } ]
[;]

EXEC dbo.sp_add_job
   @job_name = N'BackupDBTestJob',
   @enabled = 1,
   @description = N'Create a complete backup of database TestDB' ;
GO

EXEC dbo.sp_add_jobstep
    @job_name = N'BackupDBTestJob',
    @step_name = N'Create the backup',
    @subsystem = N'TSQL',
    @command = N'BACKUP DATABASE DBTest TO DISK = ''c:DBTest.bak'''
GO

EXEC dbo.sp_add_schedule
    @schedule_name = N'RunOnceAt23',
    @freq_type = 4, -- means run daily
    @freq_interval = 1, -- means run once every 1 day
    @active_start_time = 233000 ; -- means at 23:00:00
GO

EXEC sp_attach_schedule
   @job_name = N'BackupDBTestJob'
   @schedule_name = N'RunOnceAt23;
GO