Adam writes:

> I must admit I agree with Bruno on this matter, and am personally VERY
> interested in seeing such a feature in BackupPC, but I don't think
> it's worth my while forgoing the other excellent features of BackupPC
> by using another solution such as rdiff-backup to gain it. Under
> certain usage scenarios such as the one Bruno describes differential
> storage can give massive storage space benefits. Another example is
> those working on digital video and image editing: enormous files that
> may have many GB of history that doesn't change despite other parts of
> the file changing or being added to. As Bruno says another advantage
> is competition with commercial products, as it's a listed feature for
> many of them.
>
> It is in fact mentioned in the roadmap at
> http://backuppc.sourceforge.net/faq/roadMap.html , right down
> the bottom, as "speculative" due to the apparent large amount
> of effort needed to get it working. Seems as though that
> roadmap is a little out of date though- I think at least the
> first two items are now done right?

Yes, the todo list is out of date.

> Still, even the 15-20% storage gain on an average large pool mentioned
> there isn't to be taken THAT lightly ;-)

Sure, but it really does require a significant set of changes.
My long term plan would be to combine this with implementing
time-reverse deltas to store the backups.  That's a major
rewrite that would also be incompatible with current pools.

Craig

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