Veritas-bu

[Veritas-bu] Separate Incremental and Full

2005-08-05 07:49:40
Subject: [Veritas-bu] Separate Incremental and Full
From: rdgroot AT no.casema DOT nl (Ruben de Groot)
Date: Fri, 05 Aug 2005 13:49:40 +0200
You should put the incrementals in a different policy.

Thomas Stewart wrote:

> I have a policy with 6 schedules, one for each day of the week except 
> Sunday, each one does a full backup with a 2 week retention. The 
> purpose for these backups is disaster recovery.
>
> However if a user wants to restore a file that was deleted 3 months 
> ago, we are in trouble. For this reason I want to start some sort of 
> long term backup. As the data is quite static I decided long term 
> incremental backups would use the least amount of tapes. For instance, 
> a cumulative incremental each Sunday with a 12 month retention. 
> Initially I would need a full set of tapes, but for each subsequent 
> week I would only need 1 or maybe 2 tapes.
>
> I have tried this and it did not work as I expected:
>
> 01. Monday,     Full
> 02. Tuesday,    Full
> 03. Wednesday,  Full
> 04. Thursday,   Full
> 05. Friday,     Full
> 06. Saturday,   Full
> 07. Sunday,     Incremental
> 08. Monday,     Full
> 09. Tuesday,    Full
> 10. Wednesday,  Full
> 11. Thursday,   Full
> 12. Friday,     Full
> 13. Saturday,   Full
> 14. Sunday,     Incremental
>
> After some testing I realised that backup number 14 was doing a 
> cumulative incremental from the last full backup, which was backup 
> number 13. I wanted it to do a cumulative incremental against the last 
> cumulative incremental ie backup number 07. The problem with this is 
> that a file created and backed-up during the week on Thursday will 
> only be on tape with a 2 week retention, not the 12 month that I require.
>
> The main reason I want cumulative incremental is to save tape cost, 52 
> full sets of tapes will be megabucks. How do I go about solving this 
> problem?
>
> Regards
> -- 
> Tom
>
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