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Re: Another backup question



On Sunday 12 March 2006 17:16, Les Mikesell wrote:
> On Sun, 2006-03-12 at 06:43, Anne Wilson wrote:
> > On Sunday 12 March 2006 10:53, Paul Smith wrote:
> > > On 3/12/06, Anne Wilson <cannewilson tiscali co uk> wrote:
> > > > Part one - making a script to create the second generation backup
> > > > onto diskB - is not a big problem.  What is a bigger problem is what
> > > > to use for the second part.  Rsync does not seem to be the right tool
> > > > for this. I don't want all the older stuff copied back onto the
> > > > workstation, I just want the new stuff added to the archive.  I'm
> > > > mainly thinking of a photo archive.
> > >
> > > Rsync can be configure in order to copy only the new stuff: option -u.
> >
> > Ah, yes.  That brings up another question.  I had always thought that
> > rsync was bi-directional - i.e. it synchronises the source and
> > destination so that they are identical.  Then someone said that it
> > doesn't do that at all, it is uni-directional.  It's a long time since I
> > read the man page - I'll do that today - but any help/guidance/experience
> > would be appreciated.
>
> Rsync only copies in one direction at a time.  You can use the
> -u option to only copy newer files, then repeat the other
> direction to move updates both ways, but it won't get
> deletions and conflicting updates right.  There is a
> program called unison that uses state files to track
> changes on each system between runs to resolve the
> differences.
>
I remember hearing of unison before.  I'll take a look at that, thanks.

Anne

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