In this episode, we'll explore the intricate system and architecture design behind Apple's iCloud. We'll break down how Apple seamlessly handles billions of users by combining Cassandra and FoundationDB to power iCloud's backbone. What prompted Apple to shift from Cassandra to FoundationDB, and how does this choice impact scalability and performance? Get a closer look at the architecture that makes iCloud tick, and discover how it enables such a smooth user experience. The surprising reason behind Apple’s tech pivot might just change the way you think about designing cloud storage systems.