On Monday 11 July 2005 18:50, Phil Stracchino wrote:
> On Mon, Jul 11, 2005 at 11:44:36AM +0200, Ren? Brask S?rensen wrote:
> > Hi All
> >
> > Don't know if this is the right list to ask.
> >
> > I have been looking through the bacula documentation but couldn't find
> > anything about delta compression. Do backula support any kind of delta
> > compression ? or are there any plans for implementing it i future
> > releases ? I'm asking because it frustrates me that I every night
> > transfer one file that's over 1Gb. If I had a tool which supports delta
> > compression I could greatly reduce the amount of data transfered.
>
> This is something that has been discussed in the past, but no-one has
> yet worked on an implementation to my knowledge.
I haven't read about how rsync and zsync work, but I suspect that it is called
delta comparison rather than delta compression since the incremental backup
of only what changed is based on a rolling file signature or checksum rather
than a compression technique. In fact, compressing the files can create
important problems for these techniques.
I don't see how the same technique can be used with Bacula or any other
program that does not store the files in a directory tree on disk. These
techniques seem to require having the previously backed up file available for
comparison during subsequent backups. If someone has an idea how to
implement this without having backed up files online, please let me know.
--
Best regards,
Kern
(">
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