Dropbox has been storing files on Amazon Web Services for 8 years, and Dropbox’s core business is storing files. For the past three years, Dropbox has been working on a project to migrate its file storage from Amazon Web Services to its own custom-built infrastructure. Magic Pocket is the name of Dropbox’s new infrastructure layer, and it gives Dropbox more control and improved economics.

James Cowling leads the storage team at Dropbox. In today’s episode, James takes us into the architecture of Dropbox and explains how the team moved all of the user file storage from Amazon S3 to Dropbox’s Magic Pocket infrastructure. Dropbox’s architecture is built with a focus on simplicity–and there are numerous challenges to maintaining that simplicity in the face of an extremely complex problem like this.

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