Backup Software / Backup Terms Glossary / Backup Practices / Tower of Hanoi Backup Method
The Tower of Hanoi backup strategy, named after the classical Tower of Hanoi puzzle (which consists from moving eight disks between the three spines, with no larger disk put over a smaller in a single spine), is a method originally used for backup tape rotation, but now it is a universal backup strategy.
Version 7.20.0, built on 20 December, 2018 164 MB
In the Tower of Hanoi backup retention scheme, 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.
Note: 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 during a month, for instance.
Version 7.20.0, built on 20 December, 2018. 164 MBBackup Software from Novosoft LLC. 39 USD per license.
The simplest Standard edition for home users fully supports all components needed for the Tower of Hanoi backup strategy, allowing saving data to three or more storage sites.
To create an automatic implementation for the Tower of Hanoi backup strategy, you must make some backup tasks in a New Task Wizard, with each of these tasks copying the same dataset. Here we are providing an instruction for the “four-tower” set. Please follow the next necessary operations:
These are all the operations to set up a Tower of Hanoi backup system in Handy Backup! You can select any preferred scheduling period instead of days, and also you can add any depth to this algorithm by using powers of two for an initial interval between tasks and the doubles for this interval for repeat.
Each additional backup media set added to the rotation doubles the deepness of backup history. The program uses it only when the previous sets are not in use. Thus, the later a backup media set is added to the history, the older files it stores and the less time a program will use it.
Caveat: The Tower of Hanoi backup schedule 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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