Re: Is there any way to merge an rbd image's full backup and a diff?

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Hi Ilya,

> > Yes, it's possible. It's one of a workaround I thought. Then the
> > backup data are as follows:
> >
> > a. The full backup taken at least 14 days ago.
> > b. The latest 14 days backup data
>
> I think it would be:
>
> a. A full backup (taken potentially months ago, exact age doesn't
>    really matter)
> b. Differential #1 - diff from the full backup to the 14 days old version
> c. Differential #2 - diff from the 14 days old to the 13 days old version
> d. Differential #3 - diff from the 13 days old to the 12 days old version
> ...
>
> Every day after a new differential is taken, (b) and (c) would be
> merged, keeping the number of differentials constant.
>
> >
> > In this case, I concern the effect if (a) becomes too old. However, it
> > might be a groundless fear.
>
> I would suggest re-capturing the full backup from time to time, just as
> a precaution against something going wrong with a backup based on a too
> long series of (merged) differentials.  It might be groundless concern,
> but then you can't be too careful when it comes to backups.

Thank you for your advice!
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