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Regardless of how much you planned out redundancy and fault tolerance, when disaster strikes, it can be devastating. There are three things that you should be concerned with as a network security administrator when it comes to disasters—your data, your server room, and the site in general. You need to have a powerful backup plan for your data and a comprehensive disaster recovery plan as well.
Disaster recovery (or DR for short) is pretty simple in the case of data. If disaster strikes you better have a good data backup plan; one that fits your organization’s needs and budget. Your company might have a written policy as to what should be backed up, or you might need to decide what is best. Data can be backed up to a lot of different types of media (or to other computers), but generally the best method is tape backup.