Design a File Storage Service

Medium

Design a Dropbox-like system that lets users upload, store, and sync files across devices. The system should support versioning, file deduplication, and high availability.

Functional Requirements

• Allow users to upload and download files
• Support file versioning and history
• Sync files across devices in near real-time
• Detect and handle file conflicts during sync

Non-Functional Requirements

• Ensure data durability and replication
• Support large file uploads (up to 5GB)
• Target sync latency < 500ms per change
• Handle millions of active users