It seems to be mostly web-based so it might be better suited for sharing sensitive information etc that should not fall into the hands of the service provider.

It seems to be mostly web-based so it might be better suited for sharing sensitive information etc that should not fall into the hands of the service provider. For personal encrypted sync & backup I'd guess encrypted you-hold-the-key solutions like CrashPlan, Tarsnap, Wuala and SpiderOak are better options.