[clug] Rsync Diffs

Brendan Jurd direvus at gmail.com
Mon Aug 3 06:04:32 UTC 2015

Sounds like version control to me.

Depending on the size of the files involved, you could put the whole thing
into a git repository, ship the commit diffs, and apply them at the other
end.  If the files are large, you might want to look at git-annex.  If that
doesn't suit (or you don't want to do version control) you could just use
`diff` and `patch` plus some scripting.


On Mon, 3 Aug 2015 at 15:59 Brett Worth <brett.worth at gmail.com> wrote:

> Hi All.
> While we're on the topic of backups, I have a question.
> Here's a hypothetical configuration:
> SystemA  2 x data disks DiskA and DiskB
> SystemB  1 x data disk DiskZ
> These two machine start life connected to the same network and I use rsync
> to make DiskA,
> DiskB and DiskZ identical.
> I then send SystemB to a remote place where there is no Internet access.
> There is however
> a mail service.
> I make changes only to DiskA during the work day and wish to have these
> changes
> periodically reflected on DiskZ.  Each day I can run a task that sync's
> DiskA to DiskB.
> Is there any way I can capture the changes made to DiskB in such a way
> that I could put
> that information on a CD/DVD and post it to the location of SystemB so
> that someone could
> then apply the same changes to DiskZ?
> This could be done using find/tar and some sort of timestamp system but I
> was wondering if
> there could be a more elegant way to do it.  Perhaps by capturing
> something from rsync?
> Regards
> Brett
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