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Berkovska
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Synthetic full monthly instead of weekly?

Post by Berkovska » Jun 11, 2019 5:12 am

Hi there,
I was wondering if its possible to run Synthetic full backup monthly instead of weekly, may be can be configured via powershell?

Thanks!

HannesK
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Re: Synthetic full monthly instead of weekly?

Post by HannesK » Jun 11, 2019 5:52 am

Hello,
no, this is not possible because it would result in extremely high load on the backup storage. As a result, the creation of synthetic full would probably take longer than 24h with the result that backup jobs fail.

What is your use case for a monthly synthetic full?

Thanks,
Hannes

Berkovska
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Re: Synthetic full monthly instead of weekly?

Post by Berkovska » Jun 11, 2019 7:04 am

Active full is taking a long time.

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Re: Synthetic full monthly instead of weekly?

Post by HannesK » Jun 11, 2019 7:33 am

yes, but why no weekly synthetic full? As you are a service provider, I guess you are using ReFS anyway. So space usage would not be an issue with weekly synthetic fulls.

With ReFS also monthly synthetic full would be no technical issue, but it would break all systems with classic file systems.

Berkovska
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Re: Synthetic full monthly instead of weekly?

Post by Berkovska » Jun 11, 2019 5:33 pm

Understand.
The deal is there is limited storage available, i though running monthly full would be great solution.

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Re: Synthetic full monthly instead of weekly?

Post by HannesK » Jun 12, 2019 6:50 am 1 person likes this post

due to the fact that this setting would break many installations, we do not plan that.

to save disk space in your situation I see the following options:
- use an incremental forever mode (forward or reverse)
- use ReFS (well, I don't see any good argument to point to the same blocks, but it seems to make people happy :-))

Berkovska
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Re: Synthetic full monthly instead of weekly?

Post by Berkovska » Jun 13, 2019 7:27 am

Thank you Hannesk!
The whole deal is retention for 365 days. I dont want to do forever forward because i have no idea if that will work ever at all.
So I have option with monthly full. Active full takes a long time to process but I might go with it as last resort, other than that I have no options.
I also thought of doing backup copy job, I was able even to make a script to force it to run active full monthly but since it takes over 1 day (interval) to process - it fails.

HannesK
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Re: Synthetic full monthly instead of weekly?

Post by HannesK » Jun 13, 2019 8:52 am

because i have no idea if that will work ever at all.
well, for storage corruption we have the backup copy job (you already mentioned it) and the storage level corruption guard - always mind the 3-2-1 rule :-)

In general, 365 days is not the longest chain I have seen at customers...technically not a big deal from a Veeam perspective.

If your source is too slow to finish active full in 24h, I can only suggest to split the active fulls in smaller jobs. Example: run 20 VMs active full on 1st, 20VMs on 2nd and in one month you will have backup for 600 VMs (just adjust the value to your environment)

Berkovska
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Re: Synthetic full monthly instead of weekly?

Post by Berkovska » Jun 13, 2019 10:24 am

I hear you, unfortunately there is 1 VM that takes up 80% of the backup size.
Does WAN accelerator help for Active full runs or it more for increments?

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Re: Synthetic full monthly instead of weekly?

Post by foggy » Jun 13, 2019 1:27 pm

WAN acceleration is not available for regular backup jobs. Btw, this script allows running synthetic fulls on a less frequent basis.

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Re: Synthetic full monthly instead of weekly?

Post by Berkovska » Jun 17, 2019 10:03 am

Thats a great thing! I will sure try it - seems like its what I was looking for.
Thank you Hannesk

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