This is a talk about the evolution of Dropbox's architecture from 2012: http://www.youtube.com/watch?v=PE4gwstWhmc http://www.youtube.com/watch?v=PE4gwstWhmc. I

This is a talk about the evolution of Dropbox's architecture from 2012: http://www.youtube.com/watch?v=PE4gwstWhmc http://www.youtube.com/watch?v=PE4gwstWhmc. It is incredibly detailed (down to the exact sql schema they use for file metadata etc).