When testing your internet speed, you may have noticed that the numbers reported can vary quite a bit. Internet Service Providers quote a speed, but if you read carefully you'll notice the phrase "up to", which tells you that's just the maximum possible speed they can give. There are many factors that can contribute to the speeds you actually will get.
Peggy wants to back up her Yahoo mail using Carbonite. Leo says that Carbonite will back up a basic set of files by default. But it will back up other files if she sets it to. She'll have to do that within the Carbonite's settings.