Many people are using "the Cloud" quite naturally. But it seems that
most people do not really know what it actually means. The "Cloud" is
something abstract, doesn't denote a thing really, but many. This
article wants to shed a light on the various subject-specific and
technical aspects from the perspective of an engineer and
entrepreneur: the question what the different kinds of "Cloud" really
are technically speaking to economic risks and chances as well as the
question of the security of (personal) data.