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Re: [rdiff-backup-users] Backup of changing files

From: dean gaudet
Subject: Re: [rdiff-backup-users] Backup of changing files
Date: Sun, 1 Apr 2007 19:49:30 -0700 (PDT)

without knowing anything about PITR... have you actually tried restoring 
from rsyncs in this situation?  knowing what i do about the rdiff/rsync 
algo i'm having a hard time imagining any such feature truly working over 
*all* differences.  i can imagine how PITR works, and the problem i see is 
that rdiff/rsync on a changing file produces a new file which potentially 
never existed at any point in time.

anyhow if you send a patch to ignore this error i'll apply it


On Fri, 30 Mar 2007, Baldur Norddahl wrote:

> Hi,
> I want to use rdiff-backup with my Postgresql database. The problem is that
> the tool refuses to backup files that are changing.
> The database is live and modifying the database files during the backup. This
> is fine, because I am using the PITR (point in time recovery) feature of
> Postgresql.
> Using rsync works fine for this purpose. The database files will naturally be
> damaged on the target, because they changed during the copy. However, the
> database will create journal log files which can then be used to repair the
> backup.
> All I need is a switch that tells rdiff-backup that it is ok that the target
> files will not be consistent.
> I am aware of an earlier thread on this mail list, which proposes using LVM
> for freezing the source while doing the backup. This will indeed work for my
> purpose, but will require extensively reconfiguration of my setup and should
> be unnecessary. Even using LVM, my backup will be in an invalid state (it
> equals to a database crash). The LVM option adds a lot of complexity for
> little gain.
> Thanks,
> Baldur
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