How Instagram Stores Reels, Photos, and Drafts Behind the Scenes

SATYA SOOTAR Posted on May 31           How Instagram Stores Reels, Photos, and Drafts Behind the Scenes # expo # instagram # reactnative You pull out your phone, record a 30-second Reel, add a trending audio, and hit "Save Draft" because you are not ready to post yet. You lock your phone, forget about it, come back three days later, and the draft is right there waiting for you. Perfectly intact. Nothing lost. But have you ever stopped to wonder how that actually works? Where did that video go? Who is holding onto it? And what happens the moment you finally hit "Share"? This one is for you if you are building mobile apps, studying system design, or you are just genuinely curious about how apps like Instagram handle media at scale. We are going to walk through the full journey, from the moment you tap record to the moment your Reel appears on someone's feed in another country. Why Social Media Apps Need a Special Approach to Media Storage Regular text is tiny. A tweet, a caption, a comment, all of that is just a few hundred bytes at most. But media is a completely different animal. A single uncompressed 10-second video clip on a modern smartphone can easily be 200MB or more. A high-resolution photo can be 10MB to 15MB. Now multiply that by billions of users creating content every single day. Instagram reportedly has over 2 billion monthly active users. If even a small fraction of them upload media daily, you are talking about petabytes of data moving through the system every 24 hours. This is why social media apps cannot afford to treat media storage the way a basic web form treats a file upload. They need a layered, thoughtful architecture that balances speed, cost, reliability, and user experience all at once. The core challenge is this: users expect everything to feel instant, but the actual work happening under the hood is enormous. The Journey Begins: Recording a Reel on Your Device Let's start from the very beginning. When you open Inst