I am on a PS4 and when I opened the D2 application it stated that I needed to update the file to be able to play. I have noticed that the update file is 66GB in size - is this correct? Has anyone else experienced this file size when updating?. I am hoping that it is not reinstalling the game and I have lost all my progress.
AFAIK it states that the file size is the whole game, when in reality it checks the game files and then download only the required parts (that's if you always kept the game updated, if you missed some updates it might make you download a lot more).
As far as saves go, they should never be affected by an update.