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.
Powdered Milk is milk that has been dehydrated to remove all the water, leaving just the solids behind in a powdered form. It was originally designed as a way to preserve milk. To make it, first about 1/3 of the water is evaporated from the milk under vacuum, then the milk is forced through either spray nozzles or atomizing wheels that remove any remaining water and leave just particles of milk powder behind.