Which desktop and mobile operating systems do you use? Most online backup services come with an application (called a client) that manages backups and file transfers, but not all clients are compatible with non-Windows operating systems. In addition, if you want to use the backup service from your tablet or mobile device, you'll need to choose a service that provides specific apps for these.
How much data do you want to store online? If you just want to store a few files, then consider one of the free online backup services; if you plan on backing up your entire computer contents, then consider a paid subscription to one of the services, as you can usually choose from several storage amounts. For those that work from their computers, tablets and phones, a service that offers file synchronization across these platforms is key.
How sensitive is your data? Many reviewers note that data kept on a remote server, as is the case with an online backup service, is more vulnerable to unauthorized access than data that's on your own computer. All online backup providers use some sort of encryption (and sometimes multiple encryptions), but you might not want to take a chance with your most valuable data.
How fast is your Internet connection? Initial backups of large files can take hours or days, even on a broadband connection, and it's best to perform large file backups at night or anytime you're not using your computer for anything else. Keep in mind that subsequent backups are done incrementally, which go much faster.
you comfortable backing up online? Online data storage saves time and
space, but experts say you should never put all your digital eggs in one
basket. Most services do not promise that they can restore your data should a
hardware, software or business problem occur. Consider alternatives such as