| Backup Rotation Scheme |
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As a backup process is trying to achieve a number of objectives different techniques have evolved over time: Some common rotation schemes are: INCREMENTAL BACKUP
Basically the incremental backup is just backing up onto the oldest media in the set. So with a daily backup onto a set of 14 media, you would have 14 days worth of individual daily backups, when all the tapes are used, the oldest one is inserted. This is the simple method that first comes to mind to most new computer users wanting to do backups. Was commonly used when people backed up regularly to floppy disks. GRANDFATHER, FATHER, SON
This is one of the most popular method as it achieves multiple aims in having multiple recent backups as well as the ability to refer to past revisions as well as archived data. Refer specifically to Grandfather-Father-Son Backup . TOWER OF HANOI Is a more complex rotation method, its based on the mathematics of the Tower Of Hanoi puzzle, with what is essentially a recursive method, it is a 'smart' way of achiving an effective number of backups as well as the ability to go back over time, but it is more complex to understand. SEE ALSO EXTERNAL LINKS |
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