Congratulations on making the Top 20. Your efforts to the entire ecosystem are well worthy of that position.

Thank you so much!

To answer your question: In regular operation, the load is divided up between the two. However, the servers also act as a failsafe for each other, so in an event where one of the two servers suddenly decide to not show up for work, the other one picks up the load. This happens automagically before the user even realizes there might be something wrong.