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@echo off
setlocal enabledelayedexpansion

set /p backupDir=Enter backup directory:
if not exist "!backupDir!" mkdir "!backupDir!"
for %%f in (*.txt) do (
    set timestamp=!date:~-4,4!!date:~-10,2!!date:~-7,2!_!time:~0,2!!time:~3,2!
    copy "%%f" "!backupDir!\%%~nf_!timestamp!%%~xf"
)
echo Backup complete