Spideroak actually encrypts the data on the client side. They claim they cannot read the data on their server. However this is hard to know for sure without an access to the source code.

You should care about the client software installed on your system. If it is proprietary, it is problematic. There are two free software clients I am aware of for online backup: * SparckleShare ( http://sparkleshare.org ) that, unfortunately does not encrypt your data. As a consequence, if you are concerned about the privacy of your data (it depends on them), you should encrypt them yourself before sending them. * Syncany ( http://www.syncany.org ) that looks awesome. In particular the data is encrypted on the client side. Unfortunately it is still in an early stage of development.

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