@Sphinx Google Photos has the option of saving the files As Is -- without trying to recompress them to save space.
If they are medium resolution for todays standards, and already in jpeg format, the file will be stored untouched -- and will NOT count against the allocated 15 GB space.
RAW, uncompressed images are huge and cumbersome, and unneeded unless you plan to do further processing, touch ups, professional level work. Those would be best stored locally in an external hard drive for example.
I don't use Google Photos but have read the terms and helped people who DO use them -- and their camera originals are stored untouched and without counting against quota space.
@Sphinx Check the Settings -- there is an option to turn off compression on their side, or to upload full quality version of photos.
@design_RG
Google photo is not bad with unlimited save photos you took. One thing I found is I use my cellphone took a photo is 2M. on the google photo is around 1000KB or less.
But it is free I guess cannot ask too much 😃