A long time ago, I had RPG Maker. I got into it for a while. My last project on it was something I put all my effort into. And I accidentally overwrote the Game Data with an empty Save Data file. I lost everything. That's a pretty massive blow to a 14-year-old kid.
Most recently was actually about a year or so ago. My PS3 system dies. Horribly. It was right after I got PS+ too, and the only game which had its save data uploaded was Harmony of Despair. My most devastating losses:
Saints Row 2. I had a full, legitimate 100% completion file, every mission completed, every diversion item gained, every activity done, every spraytag hit, every CD collected. What was weird was it somehow picked up a Cheats Enabled asterisk after a while.... but no cheat was flagged as on, and the game still autosaved after completing missions/activities and I still had my No Fall Damage, stuff which doesn't stick around during cheat-enabled games, and attemtping to turn on cheats gave me a warning. Losing that save made me die a little inside.
My Final Fantasy XIII-2 100% save. All fragments found, all endings completed, 5-starred the Final Boss... Oh sure, I was pissed for a while, but my most recent playing of the game got me back to that and beyond, and is now a Platinum Completion Save, which took a long damn time to get.
Lastly, my library of Soul Calibur III Create-A-Souls. I had over 100 characters. 10 Virtual Memory Cards full of these characters. What really sucks is even if I managed to save these, I can't use them, my new console isn't Backwards Compatible.
the December King said:
It's not exactly the same thing, but I installed the original Neverwinter Nights (2002) improperly onto my C drive years ago. I played the game for about an hour, but I didn't really like it, and accessed the uninstall option and waited patiently... as the uninstaller deleted my C drive.
I remember Pool of Radiance did that too. Fortunately I wasn't a victim, but holy CRAP that must have sucked.