On Sat, Mar 09, 2013 at 02:04:05AM +0100, Holger Parplies wrote:

Hello again!

> 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.

I regulary do an archive to a USB HDD that I store offsite. This is a
manual step since I have to bring the HDD, do the archiving, and then
store the HDD offsite again.

To know for sure that files that are modified in between these regular
archives, I want to make tar archives of the incremental backups and
move them on a daily basis offsite over the Internet.

Why I only want to do this for the incremental backuped files is to
reduce the amount of data over the Internet.

> 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.

That's a good point. But what I want to achieve is, at least in my
opinion, better than to only have the full manual archives that at
best will be done one or two times a month.

Maybe there is a better solution, that someone can recommend.

The most important thing is that it is simple and automatic, otherwise
it will never be done.

Best regards,
Peter Carlsson

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