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@xxxxxxxxxxxxx> 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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