Which was the most value saved game that you lost?

TDU 2 after over 100 hours. I thought it was using Steam cloud but not quite..

Skyrim ! :( I was level 80 and somehow I lost my saved game...

Stronghold Crusader. The game of my childhood and my dad reinstalled the windows. WHY DAD WHY. :'(

And recently 1 year Black Flag. :''(

DA:Origins, back in the time when i was pirating it.

Man, I owned so many imported, third-party peripherals for my Sony Playstation. One of my favorite accessories was a memory card that offered 15x the save space of my official Sony cards, letting you toggle thru fifteen different "pages"

One day I found that all but the first, default partition were mysteriously empty. That was definitely soul-crushing.

I lost memory card with 200 cars in GT4

My Dragon Quest 8 save on the ps2, lost the memory card while moving, had a few hundreds hours in the game.

Dark Souls 1 after I had just beaten a boss that took me a week to beat ... bad times ...

3 times this happened to me..

Once I accidentally deleted my 180 hrs Fallout 3 character. Started a new one after that instantly though and had just as much fun :D

Another time my sister accidentally overwrote our 98.7% save of Lego Star Wars The Complete Saga... Replayed the entire game for that 100%..

And lastly, playing Pokemon Ruby on an emulator on PC, I once closed the emulator while saving and I just got a shiny pokemon few hours ago.. Never again have I played a Pokemon game

I had a Gamecube memory card with 1019 save blocks, and it was pretty full. Didn't know the Wii made a habit of corrupting that particular size, was playing a couple GC games on it and... goodbye, countless saves. :(

...Most heartbreaking loss was when I turned on Pokemon Gold (which I'd spent more time with than Red even as a child) and the cartridge battery had died. RIP Toto and Rainbow. ;_;

Prince of Persia - Warrior Within - 80% through. :/
Reason... worst of all... broke physical copy on a fall, yay clumbsy me. :/

Couldn't bring myself to buy a new one till today and still have a sour taste on my mouth. :/

Was more than halfway through the Doom 2 expansion "No Rest for the Living" when my savegame somehow got me stuck in a wall so I couldn't move. I was able to fix it using a NOCLIP cheat code, but that prevented me from getting the achievement for completing the expansion. I would have had to start completely over, so I just completed it without getting the achievement.

~700 hours in dark souls 2
Some hacker corrupted my save and I didn't have a backup :(

you all have lost nothing compared to my 3 level 80 WoW toons, 10 other toons level 30+ . my backslash played on one 80 was 220 days. I changes my passwords before giving the game up for a while and qhen i returned a year later i cant get into my account or recover my passwords... the upside is i now have a life.
oh nope. i found dota 2.