[Veritas-bu] Full vs Incremental Backup

Here's a repsonse from François-Xavier Peretmere, Veritas ECS, that I found
in the Archives for you.

David

http://mailman.eng.auburn.edu/pipermail/veritas-bu/2001-September/005746.htm
l

<><><><><><><><><><><><><><><><><><><><>
David A. Chapa
NetBackup Consultant
DataStaff, Inc.
http://www.consulting.datastaff.com
847 413 1144
---------------------------------------
NBU-LSERV AT datastaff DOT com - Adv. Scripting
http://www.xbpadm-commands.com

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Jason
Ahrens
Sent: Wednesday, May 01, 2002 8:36 AM
To: Veritasbu (E-mail)
Subject: RE: [Veritas-bu] Full vs Incremental Backup


--- "Donaldson, Mark" <Mark.Donaldson AT experianems DOT com> wrote:
> I'm testing some new stuff, so I'm doing a full backup to a test
> pool, then
> deleting the images later.
>
> It just occurred to me: Is the incremental backup of a server the
> changed
> files as compared to the most recent full backup within the same
> class or
> any class.
>
> -Mark
>

It's actually client OS dependent.

On Unix NetBackup by default uses ctime compared to the last (relevant)
backup of a class. This makes incrementals class dependent. (i.e.: two
classes doing full backups of the same system, then incrementals, will give
you a predictable results on both classes)

In NT, NetBackup by default uses the archive bit. This renders it
class/schedule independent (i.e.: two classes doing a full backup of the
same system, then incrementals, will give you "unpredictable" backup
contents on the incrementals)

Jason

--
Jason Ahrens, System Analyst
TELUS Enterprise Solutions
http://www.telus.com


-----Original Message-----
From: Rob Worman [mailto:rob AT worman DOT org]
Sent: Sunday, April 28, 2002 6:32 PM
To: Donaldson, Mark; Veritasbu (E-mail)
Subject: Re: [Veritas-bu] Full vs Incremental Backup


same class only.


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