On Sat, Mar 09, 2013 at 07:41:24PM -0500, backuppc AT kosowsky DOT org wrote:
> Holger Parplies wrote at about 02:04:05 +0100 on Saturday, March 9, 2013:
> > Hi,
> >
> > Peter Carlsson wrote on 2013-03-08 23:21:38 +0100 [[BackupPC-users]
> Archiving incremental backups?]:
> > > Hello!
> > >
> > > Is it possible to archive only the incremental part of a backup?
> >
> > no, I don't think that is supported, and I also don't think it is a good
> > idea :-).
> >
> > > I would like to make a tar archive only of the files that is part of an
> > > incremental backup.
> >
> > What exactly are you trying to achieve? You are describing the wrong step
> > toward an unknown goal. We can't give you good advice without knowing what
> > you want to do.
> >
> > In short, a tar file of a full backup + one (or more) tar files of
> incremental
> > backups *do not* equal a snapshot of your source file system at the point
> of
> > the last incremental, simply because you lose all information about files
> > being deleted (a tar file cannot represent files that are supposed to be
> > deleted on extraction, as far as I know). Of course, you might not have
> this
> > information in your BackupPC history, if you are using tar or smb
> transport,
> > but you can fix that by switching to rsync(d), and your archives will still
> > only be tar files.
> >
>
> However, if he is talking about 'tarring' the pc tree component for a
> BackupPC incremental backup, then the deletions are indeed encoded in
> the attrib files, though I am not sure how he would intend to
> reconstruct it all in practice without some code to glue it back
> together properly unless he is already has a copy of the fulls and is
> maintaining a full incremental chain...
>
> That being said, if that is what he means, he could just literally tar
> the incremental backup tree... however, he would still lose the
> pooling benefits...
Hi,
I realize after yours and others explanations, that I have not thought
about all the shortcomings, but I was thinking this could be a good
compromise. This would allow me (at least with some effort) to restore
modified files even if a crash happened between two full archives.
I will go back to my drawing board and think more about what I want to
achieve, now that I have additional information.
Best regards,
Peter Carlsson
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