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Re: [Duplicity-talk] Seeding a remote backup

From: Kenneth Loafman
Subject: Re: [Duplicity-talk] Seeding a remote backup
Date: Thu, 14 Jun 2012 14:11:48 -0500

On Thu, Jun 14, 2012 at 11:10 AM, <address@hidden> wrote:
On 14.06.2012 17:07, Andrew Kohlsmith (mailing lists account) wrote:
> On 2012-06-14, at 11:02 AM, address@hidden wrote:
>> that's not what i suggested:
>> meant was do new incrementals against the old full to effectively shorten the chain artificially hence minimizing the chance of having a defect volume killing backups after it.
> Oh I understand now; I didn't think you could do that and have Duplicity automatically figure that out. That's a very interesting workaround!

actually duplicity just plain stupid checks the backend, sees no incrementals and naturally creates the first based on the latest full.

>> anyway, this is a workaround and no solution of course. also it does not protect you from the full getting corrupted, so you additionally need that as a copy in a safe place.
> It'd be nice if you could tell Duplicity to do something to that effect… incremental-chain-length or some such…

yeah it would.

that would be like introducing a new type of incremental, root-incremental or base-incremental which is always based on the full before it, ignoring the incrementals inbetween.

It's called a 'differential' backup, which is essentially a backup of everything that has changed since the last full backup.  We don't do that yet, but it's been requested a couple of times.  It takes up a lot more room than incrementals, but means that there's no long chain.  You only need the last full backup and the last differential.


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