On the subject of analysis files to copy, I found that only looks at date modified, either, for instance.
An Outlook PST 4,6GB in Full Backup copies integer.
The next day the PST only has 1 added email, but being different modification date, copy it whole again.
The next day the PST has not changed at all, but just the fact that Outlook reads it, will change the modification date, copy it whole again.
Are you thinking some sort of file-level analysis to copy only the changed data? In such cases we are talking about the difference between copying a 100% and 0.01% of the information, with improvements in space and time that entails.