In 2012, after a long time, I finally got back into PC gaming again, starting with Skyrim installing steam on my new laptop due to me being a traveling University student.
Then, earlier this year, that laptop that had seen me through university died, I saved most things... but none of the steam saves made it.
The games I lost progress in include:
Skyrim(60 hours)
Fallout New Vegas(Pisses me off the most. I had what I would call a perfect run, going for all the endings I wanted and was right before finishing the game)
Just Cause 2 (Though this doesn't bother me as much because the journey is where the fun is)
Far Cry 3 (Landed on the second island)
Arkham City (Now I'll never have the satisfaction of beating that stupid green riddler freak)
FTL (I got all the ships except the super secret one. Dammit)
And a bunch of other Roguelikes (Anyone who plays roguelikes and gone through them know how devastating this is)