A Data backup is performed for 3 broad purposes:
|1.||Rapid recovery from data corruption, hardware failure, or human error.|
|2.||Long term storage of data. Archive / Compliance / Audit.|
To the end, each has different time and location constraints:
|1.||Recovery from data corruption needs rapid recovery speed, and location of backup does not matter (however, you do not want your Rapid Recovery Server located in a different city, campus, if possible, building).|
|2.||Recovery Server located in a different city, campus, nor if possible, building)
2. Long term storage of data. Speed is not as much an issue, location dependent in as much as it must be access controlled otherwise, when used for compliance / audit, it may not be accepted if too many people have access to it as the archives may have been tampered with.
|3.||Disaster recovery. For this scenario, speed is not as much an issue as location, the backup data CAN NOT be in the same facility, otherwise the backup data will not be accessible (just like the live data) if the facility itself is not accessible or if it has been compromised.|