Forward Incremental – Animation of Method and Retention

KB ID: 1932
Product: Veeam Agent for Microsoft Windows
Veeam Backup & Replication
Version: All
Published: 2014-09-30
Last Modified: 2022-01-13
Languages: FR
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Purpose

This article is intended to document how Forward Incremental works, and how its retention is enforced.

Solution

There are two distinct methods of Forward Incremental:

Forever Forward Incremental

For information regarding this Backup Method please review the user guide

The following is an animation demonstrating the way Forever Forward Incremental creates restore points and enforces retention.

Note: In older versions of documentation, this retention method was referred to as Forward Incremental-Forever.

User-added image
Within this animation, the lettered squares represent blocks on a disk.

Forward Incremental Backup Method

For information regarding this Backup Method please review the user guide

This animation demonstrates how an Active Full is created.
User-added image

This animation demonstrates how a Synthetic Full is created.
User-added image

This animation demonstrates how retention is enforced.
Take note of how the number of restores points exceeds the retention setting until enough restore points in the new chain cause all points in the old chain to fall outside of retention.

User-added image

Within the above animations, the lettered squares represent blocks on a disk.

A common misunderstanding that can occur when using Forward Incremental with Periodic Fulls is that the number of restore points on disk can exceed the retention which has been set. This is normal, as the retention setting sets a minimum number of restore points or days that should be retained. Remember that until all restore points of the oldest chain have fallen outside of the retention range, no portion of that chain can be deleted.
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