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7.3.7.4. Grandfather-Father-Son scheme

At a glance

• Daily incremental, weekly differential, and monthly full backups

• Custom day for weekly and monthly backups

• Custom retention periods for backups of each type

Description

Let us suppose that we want to set up a backup plan that will regularly produce a series of daily (D),

weekly (W), and monthly (M) backups. Here is a natural way to do this: the following table shows a

sample two-month period for such a plan.

Mo Tu We Th Fr Sa Su

Jan 1—Jan 7

D D D D W - -

Jan 8—Jan 14

D D D D W - -

Jan 15—Jan 21

D D D D W - -

Jan 22—Jan 28

D D D D M - -

Jan 29—Feb 4

D D D D W - -

Feb 5—Feb 11

D D D D W - -

Feb 12—Feb 18

D D D D W - -

Feb 19—Feb 25

D D D D M - -

Feb 26—Mar 4

D D D D W - -

Daily backups run every workday except Friday, which is left for weekly and monthly backups.

Monthly backups run every fourth Friday, and weekly backups run on all other Fridays.

• Monthly ("Grandfather") backups are full;

• Weekly ("Father") backups are differential;

• Daily ("Son") backups are incremental.

Parameters

You can set up the following parameters of a Grandfather-Father-Son (GFS) scheme.

Start backup at: Specifies when to start a backup. The default value is 12:00 PM.

Back up on: Specifies the days on which to perform a backup. The default value is

Workdays.