Google Analytics setup will be included in your Pixolio account. Google Analytics provides very detailed tracking information for your site and it's visitors.
AdminJames Pierce (Admin, Pixolio) commented
the number of images you have used / have left be available to view from your account. Google Analytics will allow you to see how many hits you receive, what content is hit the most, how long people stay on your site (or a page), etc.
will google analytics also let you know how much space you've used up on the server? so one person isn't overloading it with info or anything.