Script to backup PST files w/ vshadow.exe

I need a script that uses CopyWithVSS.cmd (the code below) and vshadow.exe to backup  multiple PST files -i've tried this in the past and I could not get it to work...

setlocal 
  
@REM test if we are called by VSHADOW 
if NOT "%CALLBACK_SCRIPT%"=="" goto :IS_CALLBACK 
  
@REM 
@REM Get the source and destination path 
@REM 
  
set SOURCE_DRIVE_LETTER=%~d1 
set SOURCE_RELATIVE_PATH=%~pnx1 
set DESTINATION_PATH=%2 
  
@REM 
@REM Create the shadow copy - and generate env variables into a temporary script. 
@REM  
@REM Then, while the shadow is still live 
@REM recursively execute the same script. 
@REM 
  
@echo ...Determine the scripts to be executed/generated... 
  
set CALLBACK_SCRIPT=%~dpnx0 
set TEMP_GENERATED_SCRIPT=GeneratedVarsTempScript.cmd 
  
@echo ...Creating the shadow copy... 
  
c:\vshadow.exe -script=%TEMP_GENERATED_SCRIPT% -exec=%CALLBACK_SCRIPT% %SOURCE_DRIVE_LETTER% 
  
del /f %TEMP_GENERATED_SCRIPT% 
  
@goto :EOF 
  
:IS_CALLBACK 
setlocal 
  
@REM 
@REM This generated script should set the SHADOW_DEVICE_1 env variable 
@REM 
  
@echo ...Obtaining the shadow copy device name... 
  
call %TEMP_GENERATED_SCRIPT% 
  
@REM 
@REM This should copy the file to the right location 
@REM 
  
@echo ...Copying from the shadow copy to the destination path... 
  
copy "%SHADOW_DEVICE_1%\%SOURCE_RELATIVE_PATH%" %DESTINATION_PATH% 
  
:end

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