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Re: [Duplicity-talk] Using as a more efficient sync mechanism

From: Konstantin Ryabitsev
Subject: Re: [Duplicity-talk] Using as a more efficient sync mechanism
Date: Thu, 19 Jul 2012 10:05:15 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1

On 19/07/12 06:12 AM, Kenneth Loafman wrote:
>     ken.. how do you suppose to replay them? restoring on host[1-9]
>     would always restore the whole file, not only the changed parts.
> Whoops, you are right.  There's no way just to restore the changed
> files.  I spoke too soon.  Duplicity would try to restore all of the
> files, not just the changes, and that would be a lot worse than rsync.

It could do the following, and with relative ease, I think:


Will only download the new difftars and replay them locally. It can keep
track of changes by comparing .manifest files.


Will also go through all the signature files and verify the local
contents. If something doesn't match, it will restore these files as

I may be able to sponsor this feature through the Linux Foundation funds
if someone feels like adding this functionality either into duplicity
proper, or into a separate utility. I believe the world is hurting for
such functionality to be available -- especially considering duplicity's
builtin encryption features and its wide support of multiple backends.

Konstantin Ryabitsev
Systems Administrator
Linux Foundation, kernel.org
Montréal, Québec

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