@nico198X I don't think it's quite meant as that type of software. If you want a true replacement of Google Photos, you'll have to look into #selfhosted software for backing up purposes. Or if it's just a photo album app you want, you could look at alternative gallery apps like #AvesLibre (on #FDroid).
I use #Syncthing to back up my photos without Google Photos, myself. I've heard good things about #Immich as a self-hosted alternative, too: https://github.com/immich-app/immich
