DB Back up script - SQL Job

Create a job to take back up of a single db or the entire database. below script could serve your purpose.

declare @filePath varchar(100)
declare @fileName varchar(100)
declare @location varchar(200)
SET @filePath = N'C:\MyWebsites'
SET @fileName = 'Northwind_' +

CONVERT(VARCHAR, GETDATE(), 112) + ' ' +
CAST(DATEPART(HOUR, GETDATE()) AS VARCHAR) + N' ' +
CAST(DATEPART(MINUTE, GETDATE()) AS VARCHAR) + N' ' +
CAST(DATEPART(SECOND, GETDATE()) AS VARCHAR) + '.bak'

set @location = @filePath + @fileName
BACKUP DATABASE [Northwind]
TO DISK = @location
with init, compression

If you want to take a complete back up of the entire database server or if you want to take multiple database backup then you can use cursor.

DECLARE @name VARCHAR(50) -- database name
DECLARE @path VARCHAR(256) -- path for backup files
DECLARE @fileName VARCHAR(256) -- filename for backup
DECLARE @fileDate VARCHAR(20) -- used for file name
-- specify database backup directory
SET @path = 'C:\MyWebsites' 
-- specify filename format
SELECT @fileDate = CONVERT(VARCHAR(20),GETDATE(),112) 
DECLARE db_cursor CURSOR FOR
SELECT name
FROM master.dbo.sysdatabases
WHERE name NOT IN ('master','model','msdb','tempdb') -- exclude these databases
OPEN db_cursor
FETCH NEXT FROM db_cursor INTO @name 
WHILE @@FETCH_STATUS = 0
BEGIN
 SET @fileName = @path + @name + '_' + @fileDate + '.BAK'
 BACKUP DATABASE @name TO DISK = @fileName
 WITH init, compression 
 FETCH NEXT FROM db_cursor INTO @name
END 
CLOSE db_cursor
DEALLOCATE db_cursor