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Dell NetWorker 19.9 Administration Guide

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Virtual synthetic full backups

A virtual synthetic full (VSF) backup is the same as a synthetic full backup, except that it is performed on a single Data Domain system.

Similar to synthetic full, VSF uses full and partial backups to create a full backup. However, since the backup occurs on a Data Domain system using DD Boost APIs, the backup does not require save set data to be sent over the network. The result is improved performance over synthetic full and traditional full backups.

The following table compares traditional synthetic full and virtual synthetic full backups.

Table 1. Comparison of traditional synthetic full and virtual synthetic full backups
Traditional synthetic full Virtual synthetic full
Data is read from and written to volumes. Data movement is limited within the same Data Domain system.
Read/write for all types of volumes is supported. Only Data Domain devices are supported, and the source and destination volumes must belong to the same Data Domain system. However, the volumes can belong to different MTrees in the same Data Domain system.
The client file index is created by nsrrecopy. The client file index is created by nsrconsolidate.
Client Direct support is not required. Client Direct support is required.

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