I recently took an 890 GB takeout from Google photos and put it into Immuch. Holy crap it's amazing. I had to use a third-party importer which read all the Google photos metadata, but after about 2 hours of processing all my images were there. I've ended up with an exact perfect clone of my Google photos, including albums and metadata such as GPS location, comments etc. I was so surprised at how well it works, there's even an app for my Android phones and it syncs photos that I take now on my phone's camera. This is a really, really amazing piece of software.