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Dell NetWorker 19.9 Administration Guide

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Synthetic full backups

A synthetic full backup uses the most recent full and incremental backups to create a full backup without transferring any data from the client. NetWorker performs all the work to synthesize a full backup on the NetWorker server. A synthetic full backup gives you the benefits of a full backup, such as a faster restore, without having to perform a full backup.

The topic Synthetic full backups describes the synthetic full backup feature.

When a client backup includes the DISASTER_RECOVERY:\ save set, NetWorker will always backup volumes that are identified as critical, at a level full. NetWorker will not create a synthetic full backup for critical volumes. The DISASTER_RECOVERY:\ save set is included during full backups when either the ALL or DISASTER_RECOVERY:\ save set is specified in the NetWorker Client resource.

Synthetic full backups with save set ALL

The save set attribute of the Client resource contains the ALL save set and the backup schedule includes a synthetic full backup on Sundays. The NetWorker client host has four volumes: two are critical, and two are non-critical.

  • C:\ and E:\ are critical volumes.
  • F:\ and G:\ are non-critical volumes.

On Sundays, NetWorker performs a backup of the following save sets:

  • C:\ — At a true level full backup level.
  • E:\ — At a true level full backup level.
  • F:\ — At a synthetic full backup level.
  • G:\ — At a synthetic full backup level.
  • DISASTER_RECOVERY:\— At a true level full backup level.

Synthetic full backups with file system save sets

The save set attribute of the Client resource contains a list of all volumes and the backup schedule includes a synthetic full backup on Sundays. The save set attribute does not contain the DISASTER_RECOVERY:\ save set. The NetWorker client host has four volumes: two are critical, and two are non-critical.

  • C:\ and E:\ are critical volumes.
  • F:\ and G:\ are non-critical volumes.

On Sundays, NetWorker performs a backup of the following save sets:

  • C:\ — At a synthetic full backup level.
  • E:\ — At a synthetic full backup level.
  • F:\ — At a synthetic full backup level.
  • G:\ — At a synthetic full backup level.

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