Smart Bytes are the optimized payload that ImageEngine delivers whether it is images or other kinds of content. Smart Bytes are GBs delivered, not storage (you can keep images wherever they are today - no uploads necessary!). If you are currently delivering 1 TB of unoptimized image traffic, then if ImageEngine provides a 75% reduction, you would be using 250 GB of Smart Bytes. Yes, really, we reduce cost of your bill and pass the savings on to you monthly.