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Date:      Mon, 2 Oct 2000 14:00:22 +0100
From:      j mckitrick <jcm@FreeBSD-uk.eu.org>
To:        cjclark@alum.mit.edu
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: dump levels/incremental backups
Message-ID:  <20001002140022.A97468@dogma.freebsd-uk.eu.org>
In-Reply-To: <20000929110713.A8019@149.211.6.64.reflexcom.com>; from cjclark@reflexnet.net on Fri, Sep 29, 2000 at 11:07:13AM -0700
References:  <20000929033448.A59083@dogma.freebsd-uk.eu.org> <20000928200709.J81242@149.211.6.64.reflexcom.com> <20000929140633.A63505@dogma.freebsd-uk.eu.org> <20000929110713.A8019@149.211.6.64.reflexcom.com>

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<snip>
| There must be an easy way to express this as the inverted logic of how
| a dump decides if a file is to be included, but I can't come up with
| it right now.

So you work backwards, taking dump levels in only descending order.

I saw the explanation of tape rotation based on the Towers of Hanoi, and
while they are related, there does not seem to be a direct correlation
between the rotation method and the incremental series.  I guess I'm just
not seeing it.  But I *do* get that it allovs you to balance size of backups
and restoration effort.  I still think my strategy works, where you work
back taking every other day.

jcm
-- 
"I drank WHAT ?!" - Socrates


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