He was asking for a way to backup only the changes.  I think an incremental
dump pretty much does that.  Hence, I disagree with your statement that an
incremental dump is not a backup.


On 1/16/06, Gerhard Fiedler <lists@connectionbrazil.com> wrote:
>
> Alex Harford wrote:
>
> >> What Shawn told you is a diff, not a backup. A diff between two
> revisions
> >> is not really an "incremental backup". And one shouldn't do backups of
> a
> >> sandbox anyway, you should do backups of the repository. Which has
> nothing
> >> to do with what Shawn wrote.
> >
> > I disagree.
>
> With what exactly?
>
> With "What Shawn told you is a diff"? Apparently not.
>
> With "A diff between two revisions is not really an 'incremental backup'"?
> Usually you do incremental backups to save space and time. Usually,
> storing
> diffs exported from a repository doesn't do either. (For one thing, it
> duplicates every removed and changed line.) That's why I said that there
> is
> a difference between storing a diff and what's usually called "incremental
> backup" -- even though file diffs can be used for that. But probably not
> efficiently.
>
> Why wouldn't you take simply a backup application (or suitable script) and
> run it over the repository? After all, the OP didn't ask about clever ways
> to abuse version control systems as backup, he asked how to backup the
> repository :)
>
> > Alan, I think you are confused about how Subversion works... when you
> > get the difference between two revisions in a repository, it gives you
> > a text file that lists only what has changed, line by line.
>
> That's not a special feature of subversion... pretty much all version
> systems do that. A handy feature, and one in the core of any version
> system. But not really a good backup method, IMO.
>
> Gerhard
>
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--


Shawn Wilton (b9 Systems)
http://black9.com
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