Depending on how you're going about having these media files, you might want to take a look at the *arr stack

Like others have said, Immich is great for this. It's damn near a copy of Google Photos without all the Google which is very nice. Fair warning however, I'm about to enter week two of backing up. I've got 14000+ assets to upload, and from what I've seen the first upload is the most brutal. Good luck, traveler!

Git is the way. I run a Gitea instance so all my code lives on my home server but have used Github in the past.