ACRONIS BACKUP AND RECOVERY 10 SERVER FOR WINDOWS - UPDATE 3 User Manual page 131

Feb 5—Feb 11
Feb 12—Feb 18
Feb 19—Feb 25
Feb 26—Mar 4
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:
Back up on:
Weekly/Monthly:
Keep backups:
At all times, a backup is not deleted until all backups that directly depend on it become subject to deletion as
well. This is why you might see a weekly or a monthly backup remain in the archive for a few days past its
expected expiration date.
If the schedule starts with a daily or a weekly backup, a full backup is created instead.
Examples
Each day of the past week, each week of the past month
Let us consider a GFS backup scheme that many may find useful.
 Back up files every day, including weekends

Be able to recover files as of any date over the past seven days

Have access to weekly backups of the past month
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D D D D
D D D D
D D D D
D D D D
Specifies when to start a backup. The default value is 12:00 PM.
Specifies the days on which to perform a backup. The default value is Workdays.
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.
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: 7 days (recommended minimum)
Weekly: 4 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.
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