Tower of Hanoi Rotation Schedule

Tower of Hanoi

The Tower of Hanoi rotation schedule is a schedule according to which backup media sets are rotated in accordance with a particular rotation pattern named after the Tower of Hanoi puzzle.

The Tower of Hanoi backup rotation schedule stems from a puzzle, which was invented by Edouard Lucas, a French mathematician, and consisted of three pegs with eight discs placed on one of them.

The task was to move all the discs to another peg, never placing a smaller disc under a larger one. Just like in the game, the backup media sets are rotated through the entire backup process.

As compared to Grandfather-father-son rotation schedule, this one can employ more backup media sets and save a deeper backup history. This backup rotation schedule requires only five backup media sets to perform daily backups throughout a month, for instance.


How the Tower of Hanoi Backup Rotation Schedule Works

In this backup rotation schedule the first media set is used every second day, the second media set is used when the first set is not used and is used every fourth day, the third media set is used when neither of the previous sets are used and every eighth day and so on.

Each additional backup media set, added to the rotation, doubles the backup history, and is used only when the previous sets are not used, thus, the later a backup media set is added to the history, the less it is used and the older files it stores are.

This enables one to have a deep backup history, but does not allow storing many recent backup copies, as a daily backup is erased in two days, for example.

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