You are probably aware that if your computer crashes, there is a high chance you might lose all the data stored on it, right?
Well, how can we mitigate that?
1) DO NOT rely on LUCK or the comforting thought of "I will do it later".
This is the biggest mistake we see people do. When I was a young man, and quite naive, I thought that back-ups are for paranoid types...
Well, I still remember the first hard drive fail, a classic head crash, which rendered the disk unusable with total data loss.
It is a horrible feeling of desperation, especially when you realize there were pictures on that hard disk from your first holiday with your girlfriend-now-wife... And that, at that time, you copied them to the computer and deleted them from the camera to save space...
There is denial, no two ways about it, and you can go literally crazy if you think about all the memories you lost, so the therapy I recommend for that is just not thinking about any of it (but that's a different article, sorry).