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TAPE ROTATION EXAMPLES
 
GENERAL TAPE TRACKING
 
FIVE TAPE ROTATION
One Per Day
 
GRANDFATHER - FATHER - SON (GFS)
Daily - "Son Tapes"
Weekly - "Father Tapes"
Monthly - "Grandfather Tapes"
 
TOWER OF HANOI
A - Used Every Other Day
B - Used Every 4th Day
C - Used Every 8th Day
D & E - Used Every 16th Day, Alternating
 
GRANDFATHER - FATHER - SON (GFS)

The grandfather - father - son schedule is the most widely used method, and involves backing up data in following way:

  • Daily - "Son Tapes"
  • Weekly - "Father Tapes"
  • Monthly - "Grandfather Tapes"

This system is far more powerful than the five tape rotation, but requires more tapes.

For example, consider the calendar below:


This strategy provides you with the ability to restore data from the last week, plus any Monday over the last month, plus any month for as many monthly tapes as you have. Variations on this scheme are available, and provide a trade-off between the number of tapes required, and the number of monthly tapes available.


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