Dropbox System Design Explained Visually

Dropbox

📦

700M users. Exabytes of files.

Save on laptop → appears on phone in seconds

Guided Mode

Dropbox: Files Everywhere, Always in Sync

Dropbox has 700 million registered users and stores exabytes of data. When you save a file on your laptop, it appears on your phone in seconds. How does the system split, store, and synchronise billions of files reliably?

Why We Need This

You'll build Dropbox's architecture step by step — from a naive API-to-DB approach that breaks on large files, all the way to a chunked, blob-stored, CDN-delivered, multi-device sync system.

Key Insight

The core insight: separate file bytes (blob storage) from file metadata (relational DB), split large files into small chunks, and use an event-driven sync pipeline to propagate changes across devices.

Overview

Dropbox

📦

700M users. Exabytes of files.

Save on laptop → appears on phone in seconds

Guided Mode

Dropbox: Files Everywhere, Always in Sync

Why We Need This

You'll build Dropbox's architecture step by step — from a naive API-to-DB approach that breaks on large files, all the way to a chunked, blob-stored, CDN-delivered, multi-device sync system.

Key Insight

Overview

Dropbox System Design — Interactive Simulation

Dropbox: Files Everywhere, Always in Sync

Dropbox: Files Everywhere, Always in Sync