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When developing the business continuity plan (BCP) for an airline company, the best approach to data transfer/backup to an offsite location is:
Electronic vaulting.
Shadow file processing.
Hot-site provisioning.
Hard-disk mirroring.
In shadow file processing, exact duplicates of the files are maintained at the same site or at a remote site. The two files are processed concurrently. This is used for critical data files, such as airline booking systems. Electronic vaulting electronically transmits data either to direct access storage, an optical disc or another storage medium; this is a method used by banks. Hard-disk mirroring provides redundancy in case the primary hard disk fails. All transactions and operations occur on two hard disks in the same server. A hot site is an alternate site ready to take over business operations within a few hours of any business interruption and is not a method for backing up data.
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