[Batch] Copy contents for all of a systems drives onto a specified external HDD.

CopyAllDrivesToExternal.bat

@echo off
setlocal EnableDelayedExpansion
 
rem Loop through all of the drives to find the external HDD
for %%D in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do (
    for /f "tokens=5" %%S in ('vol %%~D:') do set "xSerial=%%S"
    if "%xSerial%"=="ABCD-1234" (
        rem TODO Specify the exact target copy base location that you want.
        set "xTarget=%%~D:\%ComputerName%"
    )
)
 
rem Loop through all of the drives, skipping the external HDD
for %%D in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do (
    for /f "tokens=5" %%S in ('vol %%~D:') do set "xSerial=%%S"
    if not "%xSerial%"=="ABCD-1234" (
        rem Attempt to gain access to the drive if it exists.
        pushd "%%~D:\" 2>nul
        if !ErrorLevel! EQU 0 (
            rem Make the target directory and copy.
            mkdir %xTarget%\%%~D
            xcopy "%%~D:\" "%xTarget%\%%~D" /D /E /Y /EXCLUDE:BackupExclude.txt
        )
        popd
    )
)
endlocal
pause
:: by David Ruhmann