04-06-2012 12:39 AM
04-06-2012 07:09 AM
NetBackup has two kinds of Incremental Backups:
Cumulative Incremental:
This will backup all changes this the last Full backup.
Differential Incremental:
This will backup all changes since last backup - Full or Incremental.
See this diagram:
04-06-2012 12:42 AM
An Incremental backup backs up only the selected files that have their archive bit set to ON, setting them back to OFF. This results in a backup of all files that are new or changed since the last backup, whether it was a full or an incremental. The advantage of an Incremental is that it takes the least amount of time and media of all the backup methods.
A Differential backup backs up only the selected files that have their archive bit set to ON but does not set the archive bit back to OFF. A Differential backup will back up all selected files that are new and changed since the last full backup. The advantage of a Differential comes at restore time; you'll need only the last full backup and the last differential to get a complete restore. In the case of restoring with Incremental backups, all the Incremental backups since the last full backup plus the last full backup would be necessary.
http://www.symantec.com/business/support/index?page=content&id=TECH7665
04-06-2012 02:20 AM
hi added some more you can check this artical.
http://www.acronis.com/resource/solutions/backup/2005/incremental-backups.html
https://www-secure.symantec.com/connect/forums/question-about-cumulative-incremental-backups
04-06-2012 07:09 AM
NetBackup has two kinds of Incremental Backups:
Cumulative Incremental:
This will backup all changes this the last Full backup.
Differential Incremental:
This will backup all changes since last backup - Full or Incremental.
See this diagram:
04-06-2012 07:48 AM
Since this question was asked in a NetBackup forum, we need to provide NetBackup specific information. The link and information you provided concerns BackupExec.
04-06-2012 07:51 AM
Since this information was asked in a NetBackup forum, we need to provide NetBackup specific information, instead of providing a link to information from a different company (Acronis), who may or may not have a different way of doing backups.
04-06-2012 07:23 PM
thanks everyone.
10-03-2018 08:10 PM
***Below Statements are Wrong:-
An Incremental backup
This results in a backup of all files that are new or changed since the last backup, whether it was a full or an incremental.
A Differential backup
A Differential backup will back up all selected files that are new and changed since the last full backup.
10-04-2018 12:04 AM
The definitions in my post above (marked as Solution) are correct.
See this extract from NBU Admin Guide I:
https://www.veritas.com/support/en_US/doc/18716246-126559472-0/v41779991-126559472