User guide

36 Copyright © Acronis, Inc., 2000-2011
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 1Jan 7
D
D
D
D
W
-
-
Jan 8Jan 14
D
D
D
D
W
-
-
Jan 15Jan 21
D
D
D
D
W
-
-
Jan 22Jan 28
D
D
D
D
M
-
-
Jan 29Feb 4
D
D
D
D
W
-
-
Feb 5Feb 11
D
D
D
D
W
-
-
Feb 12Feb 18
D
D
D
D
W
-
-
Feb 19Feb 25
D
D
D
D
M
-
-
Feb 26Mar 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.
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.
Weekly/Monthly
Specifies which of the days selected in the Back up on field you want to reserve for
weekly and monthly backups. A monthly backup will be performed every fourth such
day. The default value is Friday.
Keep backups
Specifies how long you want the backups to be stored in the archive. A term can be
set in hours, days, weeks, months, or years. For monthly backups, you can also select
Keep indefinitely if you want them to be saved forever.
The default values for each backup type are as follows.
Daily: 5 days (recommended minimum)
Weekly: 7 weeks
Monthly: indefinitely
The retention period for weekly backups must exceed that for daily backups; the
monthly backups' retention period must be greater than the weekly backups'
retention period.
We recommend setting a retention period of at least one week for daily backups.