On Sun, 2006-10-22 at 15:16 -0400, Chad Martin wrote:
> Michael Sullivan wrote:
> > Every Sunday I have cron make full backups of the /home directories
> on
> > each of my computers (it's a home network). I then run tar tvf >
> > <date>.txt on each tarball and compare it to the tarball from the
> last
> > week, and then delete from the tarball the previous week every
> > included file that hasn't changed. I make the comparison by saying
> >
> > reset; diff <last-Sunday>.txt <this-Sunday>.txt | grep
> > '<directory-name> | grep '<'
> >
> > As you can imagine, this can be quite time consuming. Is there an
> > easier way to do this? I was thinking either one included in tar
> that
> > would compare the two tarballs and then delete from the old one any
> > duplicate files. Or, is there a way to extract only the filenames
> > from "diff <last-Sunday>.txt <this-Sunday>.txt | grep
> > '<directory-name> | grep '<'" to be included in a script that
> removes
> > filenames without duplicates and then passes to tar for deletion?
>
> Have you considered using a different backup tool with better
> incremental backup functionality like dar?
>
> Chad Martin
That wouldn't work in my situation. Incremental backups get made on
days that aren't Sunday, with only files that had changed the previous
day. The Sunday backup has to begin as a full backup.
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