Feature request: A way to not save duplicate files

[Madeiner]

Hello,

i'm starting to use this fantastic app to download and archive my huge amount of reddit posts that i saved.
The idea was to run this monthly or yearly, in order to keep the data in case one day reddit is lost.
I noticed by default old downloaded html of the same post are kept (which is good: people might delete content from the web or add to old threads). I wonder if there is an easy way to delete identical saved html.
Right now it's not easy since there is a timestamp and other data in the html content that changes each time, so a simple search, compare and delete does not work.
Is there any chance you could implement a check between downloads and if the content is identical, keep only one file? Thanks