You need to run a differential and then a synthetic full immediately
following.  The synthetic basically takes your last full and applies all
the differentials to it to create a new "full" image.

Full + Diff + Diff + Diff = Synthetic Full
Synthetic Full + Diff + Diff + Diff = Synthetic Full
Synthetic Full + Diff + Diff + Diff = Synthetic Full
etc...

The "Synthetic Full" is a normal full image backup according to
Netbackup and gets used in the next Synthetic Backup.  I think there are
issues with this related to deleted files (differential backups don't
realize that something got deleted so the new full will have all the
deleted files) so I would recommend "refreshing" the synthetic with an
actual full every so often.


-Jonathan 

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of dbergen
Sent: Tuesday, February 19, 2008 2:20 PM
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Question about synthetic backups


When I attempt a synthetic backup and the most recent backup of the
client is a full backup nothing happens.

Nothing happens because Netbackup says there was no incremental backup
to analyze. My question is: So What?

I want another full backup, to a completely different volume pool,
shouldn't Netbackup realize that the volume pool is different and run
the synthetic backup again?

Hopefully someone can tell me what I am doing wrong here.

Thanks,
dbergen

+----------------------------------------------------------------------
|This was sent by dbergen AT cucbc DOT com via Backup Central.
|Forward SPAM to abuse AT backupcentral DOT com.
+----------------------------------------------------------------------


_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu