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Date: Mon, 31 Jul 2017 17:24:38 +0200
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From: "Neal H. Walfield" <neal@walfield.org>
To: Lars Wirzenius <liw@liw.fi>
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Cc: obnam-support <obnam-support@obnam.org>
Subject: Re: Migrating old backups to obnam
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On Sat, 29 Jul 2017 15:19:03 +0200,
Lars Wirzenius wrote:
> On Sat, Jul 29, 2017 at 10:58:34AM +0200, Neal H. Walfield wrote:
> > I'd like to add my old backups to my obnam repository.
> 
> Why?

Two anecdotes:

  - In 2003, I took some nice pictures.  Several years later, I looked
    at them and found that some were corrupted!  Unfortunately, the
    corruption was older than my oldest backup at the time.  This was
    in the days prior to 'zfs scrub'.

  - A few weeks ago, I realized that some files were inadvertently
    deleted in 2014.  Using my old backups, I was able to restore
    them.

> >   - The time of the backup will be the current time.  My tests suggest
> >     that using faketime tricks obnam at least with respect to 'obnam
> >     generations', but perhaps there are other places where this might
> >     be a problem.
> 
> See the --pretend-time option in Obnam, there for tests.

Thanks!

> >   - The absolute path will be wrong.  That is, I normally backup
> >     /home, but I don't want to restore by old backups to /home,
> >     because I need to keep using my NAS during the migration :).  Is
> >     there a way to fake the path so that obnam ls show /home instead
> >     of /restore?
> 
> There is no way to fake this in Obnam. It would be possible to add a
> hook that a plugin could use to transmogrify pathnames, but I've never
> been bothered enough to do that. If you do, please send a patch. :)

I'll probably live with it as is, thanks!

> >   - Generations will be "out of order".  I imagine this could be a
> >     problem with respect to aging.  For instance, if obnam assumes
> >     that a numerically larger generation is necessarily younger.  Is
> >     something like this the case?  If so, then I guess the simpliest
> >     solution is to migrate the backups in order.
> 
> Do them in order, yes.

Ok!

:) Neal

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