Hi Graeme,
By differential, I mean accumulating all the daily incremental backups into
one backup tape. I think the way it works is something like this:
On Sun take a level 0 backup ( Full backup )
On Mon take an incremental ( files that changed since the last backup ) -
level 1
On Tues, the backup should contain all the Monday's changes and Tuesday's
changes. - should be level 1 and level 2
On Wed, the backup should contaon Monday's, Tuesday's and Wednesday's
changes. - level 1, level 2 and level 3
And so on and so forth.
Thus on Saturday, the backup tape should contain all of Monday's,
Tuesday's, Wednesday's ...... and Saturday's changes.
Something akin to using concatanete with tar, where the new changed files
are simply added to the end of the tape.
Don't know if this can be done with amanda.
Bernie Wu
Graeme Humphries
<graeme.humphries To: <Bernard_Wu AT NCCI
DOT COM>
@vcom.com> cc: <amanda-users AT
amanda DOT org>
Subject: Re: Differential
backups
09/28/2005 11:09
AM
Bernard_Wu AT NCCI DOT COM wrote:
>Hi Listserv,
>Does anyone know how to configure amanda to take differential backups ??
>
>
I assume you mean a situation where you want to only back up the changes
from the previous day? I imagine you'd have to get Amanda to increase
the dump level every day until you wanted to do a full backup... so,
assuming full backups once a week on Sunday, you'd do a level 0 on
Sunday, a level 1 on Monday, a level 2 on Tuesday, etc. Of course, I
have no idea how you'd accomplish this short of shell script trickery,
as this is not really a recommended way of backing up your data, and
Amanda is sort of designed to prevent you from doing bad things to
yourself. ;)
Graeme
--
Graeme Humphries (graeme.humphries AT vcom DOT com)
(306) 955-7075 ext. 485
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