2014 images vs 2012 images

C drive is an 120GB SSD with 80.7GB used.
My backup image files are stored to a 500 GB HHD.

I am fairly new to version 2014, having been using 2012 for a few years now.

In the Acronis program list of files/back ups, it shows the back up at 84.33 GB, though the actual file is 44.87 GB. When looking at previous (imaged) files, the size that shows up in 'the list' is closer in size to the actual file.

So curious if this is correct and that the way version 2014 was written, that I have nothing to worry about - when the time comes that I need to actually use an imaged file to restore my PC or clone to a new drive.