backupScript.bat

:: Don't echo all the text to the command window
@echo off

:: Create a copy from D:\ImportantStuff\Pictures directory to the local directory HomeBackups\Pictures 
::  Robocopy's /mir switch will only copy files if they change or don't exists in the destination directory
robocopy D:\ImportantStuff\Pictures HomeBackups\Pictures /mir

:: Copy D:\Music to HomeBackups\Music
robocopy D:\Music HomeBackups\Music /mir

:: Create a variable with the current date in the format 'yyyy-mm-dd'
For /f "tokens=2-4 delims=/ " %%a in ('date /t') do (set mydate=%%c-%%a-%%b)

:: Create a variable with the current time in it
For /f "tokens=1-2 delims=/:" %%a in ('time /t') do (set mytime=%%a%%b)

:: Write the current date and time to a file named lastBackup.txt.  
::  This file will store the time of the last successful backup
echo %mydate%_%mytime% > lastBackup.txt