Normally, you should just be able to upgrade using the Retropie-Setup script. However, for myself, I’m planning on doing a quick re-install to start from a black sheet.
A couple of thing to backup :
– ROMS : “\home\retropie\ROMS” . Regular saves and Savestates are in these folders
– Scraper : If you have used the scraper of EmulationStation, this information is stored in the “\home\pi\.emulationstation\”. Two directories “gamelists” “downloaded_images”
– RetroArch.cfg : “\opt\retropie\configs\all\”
You are loosing some settings (specific configs per ROM/Emulators)