I’m looking for a solution to manage photos on a server, the Google Photos’ way, but one that protects my privacy. Someone just started a good discussion on Reddit precisely on my quest. Some open source solutions are mentioned, including Immich or PiGallery. I have experience with Monument 2, as well as Synology Photos on Synology NAS but both are tag-based 
data is my data.
Anyone with experience on this topic feel free to comment. Thanks!