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Re: [Duplicity-talk] Questions
From: |
edgar . soldin |
Subject: |
Re: [Duplicity-talk] Questions |
Date: |
Fri, 8 Jan 2016 13:32:04 +0100 |
User-agent: |
Mozilla/5.0 (Windows NT 5.1; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 |
On 08.01.2016 13:15, wighawag wrote:
> Hi,
>
> (sorry for the potential double post)
>
> New to duplicity and this looks like a cool project. I am planning to use
> it for backing up to blackblaze b2 storage which duplicity now support.
>
> I have 3 questions :
>
> - Does duplicity do global deduplication like zbackup (http://zbackup.org/)
> ?
> (in that case changing filename, moving... does not affect deduplication)
no
> - Does duplicity ever change or delete files on the repo or does it only
> append like zbackup does ? zbackup list it as a feature : "Repository
> consists of immutable files. No existing files are ever modified"
same. when a file is deleted, a marker is added but the file is still in the
older volumes.
> - In case of b2 support (or other dumb remote) how much transfer is
> performed ?
> I suppose duplicity need to download the full archive in order to perform
> its deduplication logic, or can it be smarter ?
no dedup.
as a rule of thumb
- verify and restore download a complete chain
- all other operations manage to work with the manifest files (to eg. know what
to incrementally append), which are usually caches locally
..ede/duply.net