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The term data security generally refers to securing data against unauthorized use. It can, however, also be used in the context of protecting against loss and damage of data.
Protection against unauthorized use of data
Data should always be secured so that only authorized users can access it. If it isn't, then it is open to external manipulation by unauthorized third parties. Examples of techniques used to enhance data security include firewalls, block checksums, digital signatures, disk encryption and access control lists.
Protection against data loss
Data security can also refer to protecting data against loss or damage. In order to do so, backups should be made at regular intervals to ensure your most up-to-date data can always be accessed. Backups should ideally be made automatically on a separate server.