#8 SpiderOak

SpiderOak can be used to back up, share, sync, access and store data using an off-site server. It allows the user to back up any given folder from his/her computer. One of the most defining features of this cloud storage service is that, it uses encrypted cloud storage and client-side encryption key creation, so even employees of SpiderOak cannot access users' information.

SpiderOak offers two account types, a free 2 GB version and a paid subscription for capacity above the free account limit. Users can also create a referral link, and each time the link is used to sign up for an account, an extra 1GB will be allotted to both accounts. The maximum account size that can be attained in this manner is 10GB. And it will cost you $10 a month for 100GB of storage.

It is accessible through an app for Windows, Mac and Linux computer platforms, and Android, N900 Maemo and iOS mobile platforms.

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