Dell NetWorker 19.9 Administration Guide

Incremental backups

You must perform an incremental backup of a volume only to the same device, to which a full backup of the volume was performed.

On AFTDs, selecting any backup level apart from full or incremental results in performing an incremental backup.

An incremental backup shifts to a full backup when any of the following conditions occur:

• You restart the client host for any reason when the backup is either in progress or scheduled.
• The preceding incremental backup failed.
  NOTE:This condition applies only to Windows. On Linux, an incremental backup continues even if its preceding incremental backup failed.
• You already performed 38 incremental backups to AFTD.
  NOTE:After you perform a full backup, you can perform a maximum of 38 incremental backups.
• You add a volume for the backup of the ALL save set.
• You change the size of the volume.

The incremental backup process is transparent to you and does not require any additional actions or considerations.