Both JustCloud and Crashplan are competing for the market share of the best backup services. But to start with the comparison features, it must be clear what type of a user you are. If you are a tech savvy user, go for Crashplan. Else go for JustCloud.
With it’s easy to use interface and awesome support services, JustCloud steals the deal. But JustCloud has some catches which will later be revealed once you become a paid user which you will find in my previous articles where I have detailed the catches. All in all, go for Crashplan if you are comfortable with the technical nitty gritties.