Create 300-knowledge_base--back_up_data--.md

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+Description:
+In information technology, a backup, or data backup, or the process of backing up, 
+refers to the copying into an archive file of computer data that is already in 
+secondary storage so that it may be used to restore the original after a data loss event. 
+
+Solution:
+Backups have two distinct purposes. The primary purpose is to recover data after its loss, 
+be it by data deletion or corruption. Data loss can be a common experience of computer users. 
+
+The secondary purpose of backups is to recover data from an earlier time, according to a 
+user-defined data retention policy, typically configured within a backup application for how 
+long copies of data are required. 
+
+Though backups represent a simple form of disaster recovery 
+and should be part of any disaster recovery plan, backups by themselves should not be considered
+a complete disaster recovery plan. One reason for this is that not all backup systems are able to
+reconstitute a computer system or other complex configuration such as a computer cluster, 
+active directory server, or database server by simply restoring data from a backup.
+
+In order to always poses over the latest state of your data it is recommended to do active syncing
+between the application server and the back-up service. Also, try to not only write recovery policies 
+but also put them to the test regularly to verify the plans effective coverage in case if an incident.