STEP-1
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Create Backup Job thorugh SQL Server Management Studio Express
    1. Create Folder 'COSBackup' under 'D' Drive
    2. Run SQL Server Management Studio Express.
    3. In the tree view, expand Server Objects. Right Click on 'Backup Devices', Click on 'New Backup Device'.
    4. The Backup Device dialog opens. 
          DeviceName = COSDBBackup
          File = D:\COSBackup\COSSOFTDB.bak  
    5. Right Click on 'COSDBBackup' under Server Objects => Backup Devices. Click on 'Back Up a Database'
    6. The Backup  Up Database dialog opens.
          Source => Database: COS_2015. Click OK

STEP-2
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Batch File (DataBackup2008.bat)
  sqlcmd -S MYSERVER\OFFICESERVERS -E -Q "BACKUP DATABASE MASTER TO TESTBACKUP"
  
      ..where "MYSERVER" is the name of the SQL Server physical machine. (SONY)
      ..where "OFFICESERVERS" is the name of the SQL Server. (SQLEXPRESS2008)
      ..where "MASTER" is the name of the database. (COS_2015)
      ..where "TESTBACKUP" is the name of the backup job. (COSDBBackup)
      
 
 Ref.: http://www.fmsinc.com/free/newtips/sql/SQLServerExpressDatabase/Automated_Backup.asp