At first sight this is a simple design to keep out all distractions, clean copyrighting that emphasizes how much space you have left with a down-to-earth prediction for how long it should take to reach full capacity. One big CTA, no place to get confused.
To get more detailed information for your storage usage, you can hover the bar and see your most used category.
Simple comparison table for user types and suggestions what else you can do to free-up your space.