How do I start building a photo storage software?

You'll definitely need some backend setup for a project like this. I recommend starting with Node.js and Express for the backend, and using AWS S3 for storage. There are tons of tutorials online specifically for this kind of setup. Firebase is another user-friendly option since it has built-in storage. Just pick one tech stack and start with something simple, you can always enhance it later!

Are you aiming just to store your photos or do you also plan to showcase them? If it's purely for storage, a cloud provider will do the trick. But if you're looking to display your work, consider using a pre-built gallery on a web host. There are loads available!

You don't need to make it overly complicated. A basic backend setup (like Node or Python) that handles uploads and downloads is a solid start. You can store files on S3 or even just locally at first. Focus on getting a simple version running first, and worry about a more advanced cloud setup later.