I have a great many photographs that I am unwilling to lose.  Even backing up offsite isn't sufficient for me because I know more than one photographer who diligently backed everything up at home, at the office, safety deposit box, and still lost everything in an earthquake. 

The cloud, when it involves redundant servers, seems a fine solution for me.  I'm just not particularly worried about the security implications of my PNGs and PSDs being accessed.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.