does the incremental rsync algorithm save on storage?

Wayne Davison wayned at
Wed Jul 18 05:27:02 GMT 2007

On Tue, Jul 17, 2007 at 07:27:51PM -0400, Matt McCutchen wrote:
> I can't think of an easy way to produce a chain of forward deltas.

A chain of forward deltas requires an extra copy of the backup data.
So, you'd need a start point, an end point, and the deltas would be
generated while updating the end point.  To expire old deltas, you
would apply the oldest batch file to the start-point data, and then
delete that batch file.

So, the rdiff backup approach you mentioned would take less space since
it only needs an end-point copy of the data to maintain its chain of
backward deltas.


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