A lot of good ones, but no one has mentioned Brothers: a Tale of Two Sons. Fairly short, controlling two characters simultaneously was a cool mechanic, and the puzzles were fun but not very challenging. It probably hit me the hardest of any game I’ve played. I literally teared up every time
spoiler
I pressed older brother’s interact button in the final chapter.
Almost all of the data is certainly *somewhere *on the hard drive. It sounds like it was a write to the file system records that lost the record of where they are.