Yes! All cloud backup services offer encryption of your data both during the transfer to and from your computer as well as while your data is stored on the provider’s servers. While this encryption stops others from being able to view your data, it doesn’t necessarily stop them from stealing it. But rest assured that the level of security against theft with these services most likely rivals that of your own device. So generally speaking, while not infallible, cloud backup services are one of the most secure options for storing your data.