Difference between Incremental and Differential back up
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:
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
***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.
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
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
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:
Since this question was asked in a NetBackup forum, we need to provide NetBackup specific information. The link and information you provided concerns BackupExec.
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.
thanks everyone.
