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jamessa
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Full Name: Jamie Andrews
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Synthetic Full Backup Retention Question

Post by jamessa »

If I am understanding this correctly, if I start a new Job on Sunday with Saturday being the day I create a Synthetic Fulls and have my retention set to 13 days I will essentially have the original Full VBK backup and 2 additional Full VBK Synthetic Backups? I really only want no more than 2 full VBK files at a time but I do not want to set my retention to below 5 to achieve this. Is the only way around this to Transform previous full backups?

Thanks

Alexey D.

Re: Synthetic Full Backup Retention Question

Post by Alexey D. »

Hello Jamie,

Given 13 points for retention, you will generally have 2 synthetic fulls on disk, and in some days - 3. This happens because incremental passes "cannot survive" without their "parent" full backup. And in order to preserve retention policy, B&R has to keep a full chain even if a part of this chain is no longer needed.

Please refer to this topic for further explanation how things work: Rollback points and full backups

In your case, you can use Transform or switch to Reverse Incremental mode. Hope it helps!

jamessa
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Posts: 31
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Joined: Jul 06, 2010 9:06 pm
Full Name: Jamie Andrews
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Re: Synthetic Full Backup Retention Question

Post by jamessa »

Alexey,

First thanks for your response!

Second,

If I go the route of Forward incremental with synthetic fulls and transform, will this work with the Linux agents if I backup to a Linux OS in a different site?

Alexey D.

Re: Synthetic Full Backup Retention Question

Post by Alexey D. »

Jamie, yes, this should work and I don't see any drawbacks.

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