unlikely to happen(spoilers)
When alex lost his book as the old lady threw his notebook on the fire.
If you are working on something important it is just natural that you have lots of backup copies. In my case, when I have an important work I keep a copy on my email, another one on my pen drive and another one on the computer from the university I study. That makes a total of 4 copies(counting the one in my main computer). All which is a prevention from an accidental deletion or anything else.
Now imagine a book, which probably took him some months to write, it would need even more security compared to my example, but he didnt have even one single extra copy.