once, in university, I worked really hard coding a homework for an OS class (spent around 2 hours or so). It was modular, well engineered, had inode stuff all t

once, in university, I worked really hard coding a homework for an OS class (spent around 2 hours or so). It was modular, well engineered, had inode stuff all taken into account, it was efficient and I was feeling very nice. I then lost it all. I felt grief. I started again but was infuriated. Lesson: ALWAYS MAKE A COPY OF YOUR WORK!! (You did not specify what kind of grief)