Cloud file storage on Azure with chunked uploads to Blob Storage, delta sync, deduplication, and cross-device synchronization.
Difficulty: intermediate
Tags: file-storage, sync, deduplication, chunked-upload, azure
Dropbox synchronizes billions of files across hundreds of millions of devices by chunking files into 4MB blocks and deduplicating at the block level, storing identical content only once. Delta sync transmits only changed blocks, dramatically reducing bandwidth while maintaining consistency across all connected devices. Ideal for teams building cloud file sync products that need block-level deduplication, delta transfers, and cross-device consistency.