Design a File Storage Service

Build a cloud storage platform similar to Dropbox or Google Drive that allows users to upload, store, and share files.

Functional Requirements

• Upload and download files of any size (up to 50GB)
• Organize files in folders with a hierarchical structure
• Share files/folders with other users or via public links
• Sync files across multiple devices
• Maintain file version history

Non-Functional Requirements

• 99.99% durability (never lose data)
• Support billions of files and petabytes of storage
• Fast uploads with resume capability
• Real-time sync across devices

Questions to Consider

• How will you handle large file uploads efficiently?
• What storage architecture ensures durability and cost efficiency?
• How will you detect and sync changes across devices?