Deployment - How to take incremental backup of sqlserver database using MSBuild

You need to use TaskAction as "Backup" and set Incremental to true. See below.

<MSBuild.ExtensionPack.Sql2008.Database 
	TaskAction="Backup" 
	Incremental="true"
	MachineName="machine name"  
	DatabaseItem="database name" 
	DataFilePath="\\backups\Test.bak"
>

Hope this helps.

 <MSBuild.ExtensionPack.Sql2008.Database TaskAction="Backup" DatabaseItem="$(DatabaseName)" MachineName="$(SqlInstance)" UserName="$(SqlUserName)" UserPassword="$(SqlPassword)" DataFilePath="$(ProductionBackup)"/>

<Project ToolsVersion="4.0" DefaultTargets="Default" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
     <PropertyGroup>
         <TPath>C:\Program Files\MSBuild\ExtensionPack\4.0\MSBuild.ExtensionPack.tasks</TPath>
         <SqlInstance>myremoteserver</SqlInstance>
         <ProductionBackup>c:\DatabaseBackups\MyDB.bak</ProductionBackup>
         <SqlUserName>user</SqlUserName>
         <SqlPassword>pass</SqlPassword>
         <DatabaseName>MyDB</DatabaseName>
     </PropertyGroup>
     <Import Project="$(TPath)"/>
     <Target Name="BackupDB">
         <!-- Backup a database -->
         <MSBuild.ExtensionPack.Sql2008.Database TaskAction="Backup" DatabaseItem="$(DatabaseName)" MachineName="$(SqlInstance)" UserName="$(SqlUserName)" UserPassword="$(SqlPassword)" DataFilePath"\\$(SQLInstance)\C$\DatabaseBackups\MyDB.bak" 

/>
         <!-- Verify a database backup -->
         <MSBuild.ExtensionPack.Sql2008.Database TaskAction="VerifyBackup" MachineName="$(SqlInstance)" UserName="$(SqlUserName)" UserPassword="$(SqlPassword)" DataFilePath"\\$(SQLInstance)\DatabaseBackups\MyDB.bak" 

/>
    </Target>
</Project>

<MSBuild.ExtensionPack.Sql2008.Database 
         TaskAction="Backup" 
         Incremental="true"
         MachineName="machine name"  
         DatabaseItem="database name" 
         DataFilePath="\\backups\t.bak"
>