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Backup Exec synthetic backup

Posted on 2005-04-06
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How far can you trust synthetic backup under Backup Exec 10?

I felt fairly secure with a weekly full backup plus daily incrementals/differentials knowing that the worst case was a week's data lost (since the full backup contained every file needed to restore by definition) and the nominal restore case was only a day's data lost since the inc/diff would probably restore files updated on a weekday.

Now I am faced with the version 10.0 option of creating a "synthetic" full backup every day. I am lead to believe this is the equivalent of merging yesterday's "full backup" with today's incremental and then calling the result today's "full backup." Is that really the case or am I missing a trick here? Does it rely on the archive bit or do they have some more guaranteed method of ensuring the the full/baseline [??] is reasonably up to date?
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Question by:andyalder
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by:huntersvcs
ID: 13720366
From what I've read:

The synthetic backup feature enhances restore times without the need to take a full backup by seamlessly melding together smaller incremental backups into a single synthetic full backup, expediting data restores and consuming minimal network bandwidth.

I would expect this to REPLACE the need for continual FULL BACKUP, but I wouldn't completely depend on it.  Probably for those users requiring full backup on multiple tapes on a daily basis.  Less tape change, less band-width usage, easier to administer.  Doesn't sound like it should replace FULL BACKUP, only enhance the normal routine, thus making RESTORE a lot easier (you never know WHEN something changed, you only what to restore it!).
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by:andyalder
ID: 13720659
>The synthetic backup feature enhances restore times without the need to take a full backup by seamlessly melding together smaller incremental backups into a single synthetic full backup, expediting data restores and consuming minimal network bandwidth.

I read that as well; they are great marketing words juxtaposed to meld seamlessly with each other but what the hell does it mean?
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by:OpTiCz
ID: 13727103
Synthetic Backups should be fairly safe. Your just taking your last full, then all your incrementals and rebuilding your full. All synthetic Backups need to goto a Disk to Disk Backup. Setup a policy for it, then setup another policy to copy your Full on Disk to tape.
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by:andyalder
ID: 13762951
I  found  the naswer myself, amongst the marketing blurb  rather than in the manual since there doesn't seem to be a proper downloadable manual  available yet...

"Leverage Windows Change Journal integration and use the Windows modified time instead of relying on the archive bit – allowing incremental and differential backups to run faster by eliminating the need to perform larger, full backups. "

If it uses the modified timestamp rather than the archive bit I no longer have to worry about someone inadvertently resetting the archive bit by doinga full backup with a different product.

I will ask CS to refund  points since nobody pointed out that the archive bit is not used with synthetic backup unless anyone objects within the next few days.
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RomMod earned 0 total points
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The question has been PAQ'd and the 250 points have been refunded.
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