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Synchronizing the files on two machines


I would like to be able to synchronize the *certain* files on two
machines that are *not* directly connected to each other.

More precisely, I have to transfer data daily between two machines and
the only convenient way to do that is through floppies (ZIP /
rewritable CDs).  Do you know a program that would keep a set of
files/dirs (with recursion but with possible exception of some
subdirectories and files given by regexps) synchronized on the two
machines.  That means in particular that files/dirs created/deleted on
some host should be having the same treatment on the other host.
Preservation of permissions and uid/gid is important (with provision
if the numeric uid/gid differ for a given symbolic uid/gid on the two
machines ?).  Ideally, it would keep a backup copy on the floppy (in
case I do something really wrong!).  It would also detect if a file
has been modified on the two machines and prompt for what to do.  If
the first disk is full, it should be able to `span' the data on other
ones.  A report of every session would be nice.

Well, you get the idea.  If you know of an utility more or less
fitting the description above, I am really interested!  (I suppose I
am not the only one with such a problem.)


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