In case of normal OS level backups Full backup is required to go with a cumulative backup. But in case of NDMP even if Full backup has expired, we can still restore data from a cumulative backup if data is in the cumulative backup image.
From: JLightner AT water DOT com
To: veritas-bu AT mailman.eng.auburn DOT edu
Date: Tue, 16 Oct 2012 15:27:29 +0000
Subject: Re: [Veritas-bu] Incremental backup question
The incremental will have any files it backed up still on it and those can be restored. However unless most of your files change on a daily basis you’re not likely to have most of the files in the incremental.
That is to say that a full OR an incremental CAN be restored without respect to the other backups but the INTENT is that the full be restored first then the subsequent incrementals (or a single cumulativeincremental)
since that full should be restored on top of it to get the changes since the full.
If the full expired but the media it was written on has not been reused you can re-import the full and then restore it. The re-import will change the expiration date relative to the date of import rather than
the date of backup.
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu]
On Behalf Of Whelan, Patrick
Sent: Tuesday, October 16, 2012 9:57 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Incremental backup question
I suppose the answer is obvious, but I’m having trouble getting my head around it.
What happens to an incremental backup whose dependent full has expired.
A full backup is run and expires in 90 days. 89 Days later an cumulative incremental is run and expires in 30 days. Two days later the Full expires. Is the incremental still useful? If so, to what extent.
Senior NetBackup Specialist
+44 (0)207 995 9715
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