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Grandfather-Father-Son Method

 
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Q5.Kevin is using GFS (Grandfather-Father-Son) method to backup file server for the last 1 years. He is asked to restore a file that was 6 months old. How many tapes does he need to use for the restoration of the file?

A. 20
B. 5
C. 11
D. 1

  Correct Answer: D

 

Explanation:
The only tape required would be the FULL monthly backup tape corresponding to the said month. Note that daily incremental backup tapes get rotated every week, and the weekly full backup tapes get rotated every 4 weeks. Only monthly backup tapes are stored securely for one full year. Therefore, to restore a file that was 6 months before, you need only one monthly backup tape corresponding to that period.
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