This is a solid cloud solution for your art collection. We recommend Collectrium for its security, ease of use, and sleek design. This also seems to be the only art focused solution for the art world, which I think is pretty powerful.
Response from Collectrium:
16 January 2015 at 10:48
Thank you for your trust. If you need more information on our security, check out our website at http://www.collectrium.com/security/. From this page, you can request a white paper as well.