Design a File Sync Service · System Design Interview

Design a File Sync ServiceDesign a service that keeps a folder identical on every device someone signs into, and lets them share it with other people.What it has to do

A change made on one device reaches that person’s other devices

A device that was offline catches up when it comes back

A folder can be shared with someone else, who can change it too

Scale

Users: 400 million

Files stored: 100 billion

File changes per day: 3 billion

Out of scope

Editing documents in the browser

Searching inside files

Storage quotas and billing

Recovering a file deleted months ago

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