Data encryption is also an important security feature in areas outside of the network layer. Often, database administrators will make backups of their data and store them on file servers. These file servers may not be as hardened as the sensitive databases that host the “live” copies of the data. It’s very important to keep in mind that, by default, most relational database systems do not provide very strong security for backups. Because, in most cases, database backups are every bit as valuable as the live databases themselves, encryption, properly administered file system permissions, and related best practices should be followed.
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