Since i just experienced my save game being gone after the game crashed (on Honor mode where i only have one), i searched for the file in question and managed to restore it.
I would like to share this information to those who might have suffered from the same fate, and hopefully, restore their saved game too. (This should work for lost Multiplayer games too)
Here are the same easy steps to follow:
1.) Go to your Divinity Original Sin 2's game folder. Which should be here:
C:\Users\[Insert your user here]\Documents\Larian Studios\Divinity Original Sin 2 Definitive Edition
2.) Find the savegames folder. Which can be found in the PlayerProfiles folder, then click on your profile name folder and lastly go to the Savegames.
3.) Click on the Story or GM folder depending on which mode your savegame was for. Then, look for the most recent save file and click on that folder.
4.) If the save file reads; [insert savefile name here].lsv.old, then all you have to do is to rename the savefile and remove the .old from the name "[insert savefile name here].lsv" to resolve the issue.
For example: HonourMode.lsv.old <--- Is Wrong
HonourMode.lsv <--- Is Correct
It's recommended that you make a of copy the save file before you rename it. Just in case.
5.) Start the game and see if your save game is back!
Hope this helps atleast some people.