GFS (Grandfather Father Son)

Grandfather-father-son backup is a common rotation scheme for backup media, in which there are three or more backup cycles, such as daily, weekly and monthly.

The daily backups are rotated on a daily basis using a FIFO system as above. The weekly backups are similarly rotated on a weekly basis, and the monthly backup on a monthly basis.

In addition, quarterly, half-yearly, and/or annual backups could also be separately retained. Often some of these backups are removed from the site for safekeeping and disaster recovery purposes.

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