User`s guide

Introduction 3
1
Cumulative-Incremental Backup
When the NetBackup master server is configured to perform a cumulative-
incremental backup, NetBackup backs up all files that have changed since the
last successful full backup.
Cumulative incremental backups can be configured to use either the datetime
stamp or the archive bit. If the datetime stamp is used, the cumulative-
incremental backup includes all files with a datetime stamp that are more recent
than the last full backup. If the archive bit is used, the cumulative-incremental
backup includes all files that have their archive bit set. Archive bits are not
cleared on cumulative-incrementals. Refer to "General Property Sheet" on
page 67 for more details on performing incremental backups with archive bits.
Differential-Incremental Backup
When the NetBackup master server is configured to perform a differential-
incremental backup, NetBackup backs up all files that have changed since the
last successful backup.
Differential incremental backups can be configured to use either the datetime
stamp or the archive bit. If the datetime stamp is used, the differential-
incremental backup includes all files with a datetime stamp that are more recent
than the last backup, full or incremental. If the archive bit is used, the
differential-incremental backup includes all files that have their archive bit set.
Archive bits are cleared on differential-incrementals if the file is successfully
backed up. Refer to "General Property Sheet" on page 67 for more details on
performing incremental backups with archive bits.
True Image Backup
A True Image Backup takes place when the True Image Restore Information
attribute has been set on the NetBackup master server. When this attribute is set,
NetBackup collects additional information necessary to restore a folder to exactly
what it was at the time of the full backup or incremental backup.
Only those backups, performed with the True Image Recovery Information
attribute set on the NetBackup master server, can be used for the true image
restore. For complete details, refer to the NetBackup System Administrator’s Guide
- UNIX or the NetBackup System Administrator’s Guide - Windows NT Server.