Did you read Validating, Rebuilding, and Filtering ROM Collections? If not, it could help you understand the basics and some specifics about building a romset. The article uses a MAME romset for example, but you can use most if not all of the tools mentioned there also for console romsets. I use RomCenter with full no-intro romsets (i.e. with all regions in them) and Parent-Clone XML no-intro dats to build a regional mix of my liking. RomCenter can priorize the regions, e.g. use the US version of a game if available. If it's not, use the Japanese version, then the Australian, than the European and so on.

@Sebiohazard Can you give me an example - a game that doesn't work ? The info might not be on the scraping site for that particular game.

@maegirom said in All scraped data and games in favorite list are gone oO': What is that append option you are talking about? where is it? I think I haven't noticed it anywhere. I only used the scraper from the RetroPie-Setup menu, where the Gamelist appears I didn't use it from the command line and I don't know what's the default. It's adviced to update drivers or something? If you like to get bugfixes and new features, yes, but it's not mandatory. Make sure to update from the RetroPie-Setup menu, as explained in the docs.

@atexplosion delete old gamelist.xml and rescrape. It's a bad ide to keep the old gamelist when doing a new scan.

can also do it via a usb stick which can backup/restore configs.