SpiderOak offers "Zero Knowledge" cloud based backup solutions. Privacy has always been a key feature of their online backup product and continues to be a primary focus.
SpiderOak offers desktop clients for PC, Mac, and Linux to support access to backed-up data across the big three of personal operating systems. The desktop apps include file sync features similar to Dropbox and Box (and MozyHome) for your convenience.
Multiple revisions of the same file can be tracked but do count against your storage plan. The desktop interface provides fine-grain control over what data is backed up. Multiple devices can be backed up using one account with SpiderOak tracking your stored data by device.
Even if you use another cloud based backup solution you may want to consider SpiderOak for highly confidential data such as financial records, real estate related documents, and business records.
...your data is 100% private and only readable by you. No plaintext data, no keys, or file meta data is ever stored on our servers. All this ensures absolute confidentiality of your data. ~SpiderOak website
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