Grandfather-Father-Son scheme

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.

Daily backups run every workday except Friday, which is left for weekly and monthly backups. Monthly backups run on the last Friday of each month, and weekly backups run on all other Fridays. As a result, you will normally obtain 12 monthly backups over a full year.

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

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 backup, marked with the

icon, for a few days past its expected expiration date.

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
Keep monthly backups indefinitely.

Backup scheme parameters can then be set up as follows.

Start backup at: 11:00 PM
Back up on: All days
Weekly/monthly: Saturday (for example)
Keep backups:
- Daily: 1 week
- Weekly: 1 month
- Monthly: indefinitely

As a result, an archive of daily, weekly, and monthly backups will be created. Daily backups will be available for seven days since creation. For instance, a daily backup of Sunday, January 1, will be available through next Sunday, January 8; the first weekly backup, the one of Saturday, January 7, will be stored on the system until February 7. Monthly backups will never be deleted.

If you do not want to arrange a vast amount of space to store a huge archive, you may set up a GFS scheme so as to make your backups more short-lived, at the same time ensuring that your information can be recovered in case of an accidental data loss.

Suppose that you need to:

Perform backups at the end of each working day
Be able to recover an accidentally deleted or inadvertently modified file if this has been discovered relatively quickly
Have access to a weekly backup for 10 days after it was created
Keep monthly backups for half a year.

Backup scheme parameters can then be set up as follows.

Start backup at: 6:00 PM
Back up on: Workdays
Weekly/monthly: Friday
Keep backups:
- Daily: 1 week
- Weekly: 10 days
- Monthly: 6 months

With this scheme, you will have a week to recover a previous version of a damaged file from a daily backup; as well as 10-day access to weekly backups. Each monthly full backup will be available for six months since the creation date.

Suppose you are a part-time financial consultant and work in a company on Tuesdays and Thursdays. On these days, you often make changes to your financial documents, statements, and update the spreadsheets etc. on your laptop. To back up this data, you may want to:

Track changes to the financial statements, spreadsheets, etc. performed on Tuesdays and Thursdays (daily incremental backup).
Have a weekly summary of file changes since last month (Friday weekly differential backup).
Have a monthly full backup of your files.

Moreover, assume that you want to retain access to all backups, including the daily ones, for at least six months.

The following GFS scheme suits such purposes:

Start backup at: 11:30 PM
Back up on: Tuesday, Thursday, Friday
Weekly/monthly: Friday
Keep backups:
- Daily: 6 months
- Weekly: 6 months
- Monthly: 5 years

Here, daily incremental backups will be created on Tuesdays and Thursdays, with weekly and monthly backups performed on Fridays. Note that, in order to choose Friday in the Weekly/monthly field, you need to first select it in the Back up on field.

Such an archive would allow you to compare your financial documents as of the first and the last day of work, and have a five-year history of all documents, etc.

Consider a more exotic GFS scheme:

Start backup at: 12:00 PM
Back up on: Friday
Weekly/monthly: Friday
Keep backups:
- Daily: 1 week
- Weekly: 1 month
- Monthly: indefinitely

Backup is thus performed only on Fridays. This makes Friday the only choice for weekly and monthly backups, leaving no other date for daily backups. The resulting “Grandfather-Father” archive will hence consist only of weekly differential and monthly full backups.

Even though it is possible to use GFS to create such an archive, the Custom scheme is more flexible in this situation.

	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	-	-

Start backup at	Specifies when to start a backup. The default value is 12:00 PM.
Back up on	Specifies the days of the week when a backup will be performed. The default value is Workdays.
Weekly/Monthly	Specifies which day of the week (out of the days selected in the Back up on field) you want to reserve for weekly and monthly backups. The default value is Friday. With this value, a monthly backup will run on the last Friday of each month. Weekly backups will run on all other Fridays. If you choose a different day of week, these rules will apply to the day chosen.
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.
Backup type	Specifies the types of daily, weekly and monthly backups Always full - all the daily, weekly and monthly backups will always be full. This is the default selection for cases when a tape drive is selected as a backup location. Full/Differential/Incremental - daily backups are incremental, weekly backups are differential, and monthly backups are full. The first backup is always full. However, this does not mean that it is a monthly backup. It will be kept as a daily, weekly or monthly backup, depending on the day of week it is created.
Advanced settings	Available only for advanced editions of Acronis Backup & Recovery 11.5 when creating a centralized backup plan. See the "Advanced scheduling settings" section for details.