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Veeam Agent for Microsoft Windows 2.0
User Guide

How Synthetic Full Backup Works

To create a synthetic full backup, Veeam Agent for Microsoft Windows performs the following steps:

  1. On a day when synthetic full backup is scheduled, Veeam Agent for Microsoft Windows triggers a new backup job session. During this session, Veeam Agent for Microsoft Windows first performs incremental backup in a regular manner and adds a new incremental backup file to the backup chain. Incremental backup helps Veeam Agent for Microsoft Windows ensure that the synthetic full backup includes the latest changes of the backed up data.

How Synthetic Full Backup Works 

  1. At the end of the backup job session, Veeam Agent for Microsoft Windows builds a new synthetic full backup using backup files that are already available in the backup chain, including the newly created incremental backup file.

How Synthetic Full Backup Works 

  1. When the synthetic full backup is created, Veeam Agent for Microsoft Windows deletes the incremental backup file created at the beginning of the job session. As a result, you have a backup chain that consists of a full backup file, set of incremental backup files and synthetic full backup file.

How Synthetic Full Backup Works 

  1. Every next job session creates a new incremental restore point starting from the synthetic full backup until the day on which synthetic full backup is scheduled. On this day, Veeam Agent for Microsoft Windows creates a new synthetic full backup.

Synthetic Full Backup Schedule

Veeam Agent for Microsoft Windows automatically triggers a backup job session to create a synthetic full backup, even if a regular backup job session is not scheduled on this day. The job session is started at the same time when the backup job is scheduled. For example, if you schedule the backup job at 12:00 AM Sunday through Friday, and schedule synthetic full backup on Saturday, Veeam Agent for Microsoft Windows will start a backup job session that will produce a synthetic full backup at 12:00 AM on Saturday.

If the backup job is scheduled together with a synthetic full backup, Veeam Agent for Microsoft Windows will produce only one backup file — a synthetic full backup that will contain the latest state of the backed up data. An incremental backup file that should have been created by the backup job schedule will not be added to the backup chain.

Veeam Agent for Microsoft Windows creates a synthetic full backup only once a day on which synthetic full backup is scheduled. If you run the backup job again on the same day, Veeam Agent for Microsoft Windows will perform incremental backup in a regular manner.

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