@bythewell - Which is why everyone should back up as much as they can. If possible, set your computer up so that it periodically saves files to an online server or to an external hard drive. Don't rely on a single place to back your stuff up. They seem old fashioned now, but I still back up my work onto CDs. As long as you look after them, they will last for a while.
I've still got stories I wrote almost 20 years ago by being careful about this. And it gives you piece of mind when working with computers, which are always going to be fickle.