Be careful of "Clouds" also. As the following article shows, sometimes they may not be available.
http://www.ekaru.com/blog/help-the-cloud-can-disappear
This next article gives an idea of the Cloud's vulnerabilities. Article is something of an advertisement. However, ignoring that and going for the "meat" of the matter is what counts, imo.
http://www.blumira.com/top-cloud-security-threats/
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