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Re: [Duplicity-talk] A couple easy questions
From: |
Travis H. |
Subject: |
Re: [Duplicity-talk] A couple easy questions |
Date: |
Mon, 1 Jan 2007 22:28:40 -0600 |
User-agent: |
Mutt/1.5.12-2006-07-14 |
A word to the wise; this list is not very active, so you may have
to wait a while before being answered.
I don't actually use duplicity (yet), but I can answer a few things.
On Sat, Dec 30, 2006 at 10:08:24AM -0800, mike wrote:
> 3. I haven't seen it specified but the archives are compressed using
> gzip, correct? Not just tar+gpg, but tar+gzip+gpg? The compression
> could happen during the GPG encryption too I suppose, I just want to
> make sure that my archives are being compressed, using -9 (best
> encryption) if possible. I don't see any switches to disable
> compression or to change the compression ratio.
If it used bzip2, you could set BZIP envar and specify -9.
I think gzip should really have something like it. If you feel like
emailing them with that suggestion, have at it. Or just patch your
duplicity to use bzip2; it gives better compression anyway.
> 4. Is there a way to disable deltas and transfer the whole file if a
> file has changed? Not do a "full backup" but just a full copy of the
> file. That could be useful (especially if things like corruption can
> break or confuse a delta enough to wreck the previous versions)
I think this is handled adequately with rsync, but not sure.
If rsync can detect silent (hardware-level) corruption, then
this isn't a problem. If it only checks mtime/ctime, you're
right.
Basically, we need end-to-end data protection. In this case, it makes
sense to do it at the application level, which gives you the fullest
protection - if the OS, network or hardware corrupt it, then you can
detect that fact and do something about it.
I'm thinking of writing a little filter that embeds integrity
checksums in the data in a variety of ways so that you can simply
run it through the filter with some flags and have the protected
data pop out.
--
A: No.
Q: Should I include quotations after my reply?
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