ZumoDrive ate my homework

I was shocked, horrified and very angry about ZumoDrive, an online drive service. I just found out that all the document I put in that drive were either gone, messed up, or unopenable. Fortunately, they are all draft for the lyrics that I was working on, and I always have a backup somewhere else, otherwise I might tear all my hairs off as I have a deadline today. This both shows the importance of having backup and also how unreliable sky drives are.