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[6] RAID Levels and SQL Server. https://technet.microsoft.com/en-us/library/ms190764(v=sql.105).aspx

[7] Whittaker, Z.: Attackers can access Dropbox, Google Drive, OneDrive files without a user’s password (2015). http://www.zdnet.com/article/dropbox-google-drive-onedrive-files-man-cloud-attack

[8] Reilly, C.: Hackers hold 7 million Dropbox passwords ransom (2014). http://www.cnet.com/news/hackers-hold-7-million-dropbox-passwords-ransom