Here are the most common default paths for standard installed versions of PCSX2 (v1.7+ Nightly and v1.6 stable):
@echo off xcopy "C:\Users\%USERNAME%\Documents\PCSX2\memcards\*.ps2" "D:\Backups\PCSX2\" /Y /D echo PCSX2 saves backed up successfully. pause pcsx2 save game location