[wix-users] Custom action to backup folder before install

[Carlos Sosa]

Hello I need to back up the INSTALLFOLDER before upgrade/install.
I'm using a custom action as follows:

<InstallExecuteSequence>
    <Custom Action="BackupDB" After="InstallInitialize" />
</InstallExecuteSequence>


But I cannot seem to be able to define the custom action appropriately

<Fragment>

   <CustomAction Id='BackupDB'
                 BinaryKey='FooBinary'
                 DllEntry='FooEntryPoint'
                 Execute='immediate'
                 Return='check'>


    <CopyFile Id="SomeId" SourceProperty="SOURCEDIRECTORY"
      DestinationDirectory="INSTALLFOLDER" SourceName="*" />


   </CustomAction>



  </Fragment>


Using Visual Studio 2015 and Wix 3.1
Any help is appreciated.
Regards