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Backup vs. restore

Can you please explain to me what backup and restore are? Also what's the difference between the two, and why are they important?

Backup is the process of copying objects (programs, system values and/or data) to an outside media (tape, CD, disk) in a format that has the capability to be returned (restored) to the system in exactly the same image. Restore is the process of returning objects, data or both to a system to reflect a previous image. The difference should be self-explanatory. The importance of back up would be based entirely on reliability and/or risk. Some systems require little or no backup. Some require constant backup. The importance of restore falls under the same risks as backup, except that the restore adds time and recovery levels to the risk equations.


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