If I have a library on SharePoint 2010, which creates new files for every new version, if version history is enabled, and I upgrade to SharePoint 2013, which only stores delta files or changes i version history is enabled, what actually happens with the"files" in the content database representing older versions of my files?
The question is interesting because in SharePoint 2010, due to the way it stores older versions of files, it can take up significant amout of storage space.