If the trend in storage pricing continues, Dropbox would be unable to charge anything at all for any of their plans within a few years. So instead of lowering prices they increase storage, which is a fairly safe thing for them to do, because people only use the space they need.
Evaporated milk is exposed to high heat to reduce its water content and then preserved in a can. Pumpkin pie recipes sometimes require evaporated milk. Evaporated milk can be used to make fudge.
Like evaporated milk, sweetened condensed milk has had 60% of its water removed, however it has also has sugar added to it. The added sugar makes it very thick and high in calories. Like evaporated milk, condensed milk does not require refrigeration and can last for years as long as the can remains unopened.