Date: Mon, 31 Jul 2017 17:28:01 +0200
Message-ID: <87r2wwhbi6.wl-neal@walfield.org>
From: "Neal H. Walfield" <neal@walfield.org>
To: Lars Wirzenius <liw@liw.fi>
In-Reply-To: <20170729131625.rvfvel7d5vrl7hoo@liw.fi>
References: <87mv7nty3v.wl-neal@walfield.org>
 <20170729131625.rvfvel7d5vrl7hoo@liw.fi>
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Cc: obnam-support <obnam-support@obnam.org>
Subject: Re: Backups of backups
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Sender: obnam-support-bounces@obnam.org
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On Sat, 29 Jul 2017 15:16:25 +0200,
Lars Wirzenius wrote:
> > My current backup of backup solution is to use 'zfs send' to replicate
> > my backup to an offsite location.  This works great, but has the
> > limitation that the offsite server has to have the same amount of disk
> > space as the onsite server.
> > 
> > Does obnam have any support for backups of backups?  For instance, I
> > think it would be cool to just propagate a particular generation?
> > Then, my offsite backup might only have the last few backups, but the
> > onsite backup could keep a longer history.
> 
> Obnam doesn't support that. If you want to have backups in two
> locations, why not run Obnam twice, once per location?

Unfortunately, it is cheap to send data, but expensive to read it.  If
I correctly understand how obnam works, then obnam does a lot of
reading to compare data even if nothing has changed.  (If that's not
true, then please correct me!)

Thanks!

:) Neal

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