T-SQL Backup Script

USE [master]
GO
/****** Object:  StoredProcedure [dbo].[sp_BackupDatabases]    Script Date: 5/25/2013 2:38:32 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

-- =============================================
-- Author: Microsoft
-- Create date: 2010-02-06
-- Description: Backup Databases for SQLExpress
-- Parameter1: databaseName
-- Parameter2: backupType F=full, D=differential, L=log
-- Parameter3: backup file location
-- =============================================

CREATE PROCEDURE [dbo].[sp_BackupDatabases]
            @databaseName sysname = null,
            @backupType CHAR(1),
            @backupLocation nvarchar(200)
AS

       SET NOCOUNT ON;

            DECLARE @DBs TABLE
            (
                  ID int IDENTITY PRIMARY KEY,
                  DBNAME nvarchar(500)
            )

             -- Pick out only databases which are online in case ALL databases are chosen to be backed up
             -- If specific database is chosen to be backed up only pick that out from @DBs
            INSERT INTO @DBs (DBNAME)
            SELECT Name FROM master.sys.databases
            where state=0
            and owner_sid != 1
            AND name=@DatabaseName
            OR @DatabaseName IS NULL
            ORDER BY Name

            -- Filter out databases which do not need to backed up
            IF @backupType='F'
                  BEGIN
                  DELETE @DBs where DBNAME IN ('tempdb','Northwind','pubs','AdventureWorks')
                  END
            ELSE IF @backupType='D'
                  BEGIN
                  DELETE @DBs where DBNAME IN ('tempdb','Northwind','pubs','master','AdventureWorks')
                  END
            ELSE IF @backupType='L'
                  BEGIN
                  DELETE @DBs where DBNAME IN ('tempdb','Northwind','pubs','master','AdventureWorks')
                  END
            ELSE
                  BEGIN
                  RETURN
                  END

            -- Declare variables
            DECLARE @BackupName varchar(100)
            DECLARE @BackupFile varchar(100)
            DECLARE @DBNAME varchar(300)
            DECLARE @sqlCommand NVARCHAR(1000)
        DECLARE @dateTime NVARCHAR(20)
            DECLARE @Loop int

            -- Loop through the databases one by one
            SELECT @Loop = min(ID) FROM @DBs

      WHILE @Loop IS NOT NULL
      BEGIN

-- Database Names have to be in [dbname] format since some have - or _ in their name
      SET @DBNAME = '['+(SELECT DBNAME FROM @DBs WHERE ID = @Loop)+']'

-- Set the current date and time n yyyyhhmmss format
      SET @dateTime = REPLACE(CONVERT(VARCHAR, GETDATE(),101),'/','') + '_' +  REPLACE(CONVERT(VARCHAR, GETDATE(),108),':','')

-- Create backup filename in path\filename.extension format for full,diff and log backups
      IF @backupType = 'F'
            SET @BackupFile = @backupLocation+REPLACE(REPLACE(@DBNAME, '[',''),']','')+ '_FULL_'+ @dateTime+ '.BAK'
      ELSE IF @backupType = 'D'
            SET @BackupFile = @backupLocation+REPLACE(REPLACE(@DBNAME, '[',''),']','')+ '_DIFF_'+ @dateTime+ '.BAK'
      ELSE IF @backupType = 'L'
            SET @BackupFile = @backupLocation+REPLACE(REPLACE(@DBNAME, '[',''),']','')+ '_LOG_'+ @dateTime+ '.TRN'

-- Provide the backup a name for storing in the media
      IF @backupType = 'F'
            SET @BackupName = REPLACE(REPLACE(@DBNAME,'[',''),']','') +' full backup for '+ @dateTime
      IF @backupType = 'D'
            SET @BackupName = REPLACE(REPLACE(@DBNAME,'[',''),']','') +' differential backup for '+ @dateTime
      IF @backupType = 'L'
            SET @BackupName = REPLACE(REPLACE(@DBNAME,'[',''),']','') +' log backup for '+ @dateTime

-- Generate the dynamic SQL command to be executed

       IF @backupType = 'F'
                  BEGIN
               SET @sqlCommand = 'BACKUP DATABASE ' +@DBNAME+  ' TO DISK = '''+@BackupFile+ ''' WITH INIT, NAME= ''' +@BackupName+''', NOSKIP, NOFORMAT'
                  END
       IF @backupType = 'D'
                  BEGIN
               SET @sqlCommand = 'BACKUP DATABASE ' +@DBNAME+  ' TO DISK = '''+@BackupFile+ ''' WITH DIFFERENTIAL, INIT, NAME= ''' +@BackupName+''', NOSKIP, NOFORMAT'
                  END
       IF @backupType = 'L'
                  BEGIN
               SET @sqlCommand = 'BACKUP LOG ' +@DBNAME+  ' TO DISK = '''+@BackupFile+ ''' WITH INIT, NAME= ''' +@BackupName+''', NOSKIP, NOFORMAT'
                  END

-- Execute the generated SQL command
       EXEC(@sqlCommand)

-- Goto the next database
SELECT @Loop = min(ID) FROM @DBs where ID>@Loop

END