dan wrote at about 14:00:43 -0600 on Sunday, August 30, 2009:
> I personally think that using ssh compression is the better method. I say
> this because running rsync through ssh encrypts the data and compresses
> it(optionally). Unless you plan to run rsync in the clear then the built in
> compression isnt needed.
ssh adds overhead with its encryption. Of course, I was referring to
the case when you are comfortable running rsync/rsyncd in the clear.
>
>
> On Sat, Aug 29, 2009 at 11:36 PM, Jeffrey J. Kosowsky <backuppc AT kosowsky
> DOT org
> > wrote:
>
> > Les Mikesell wrote at about 07:37:07 -0500 on Tuesday, August 25, 2009:
> > > Nigel Kendrick wrote:
> > > > Hi,
> > > >
> > > > This may also be applicable to MySQL etc..
> > > >
> > > > I have an MS-SQL database that dumps out a backup that's around 700MB
> > in
> > > > size. BackupPC brought this over to its server via ADSL/VPN/Rsyncd
> > > > (422mins!) and when I did another data dump about 4 hours later,
> > around
> > > > 16Mb of changes to the file were transferred very quickly. However,
> > > > every single backup since then has gone back to 422 minutes. I could
> > > > imagine that the database and dump will change over time, but it seems
> > > > strange that the entire file needs copying every time - as if its
> > > > structure is always 100% different from the previous.
> > > >
> > > > I wondered if I was missing anything obvious (being a BackupPC noob)
> > > > like file time stamping causing a complete file transfer every day, or
> > > > are database dumps likely to be completely different every time?
> > > >
> > > > I will keep some copies of the dumps and do some comparisons but in
> > the
> > > > meantime any tips, thoughts etc.?
> > >
> > > I don't know anything about the contents of the file, but are these full
> > or
> > > incremental runs for backuppc? Assuming this is rsync or rsyncd, note
> > that
> > > incrementals always compare against the last full unless you have
> > configured
> > > multiple incremental levels, so they tend to transfer more each time.
> > Or there
> > > may just be enough difference that it can't find the matching parts.
> > >
> > > If you are running rsync with ssh (probably not if this is windows), you
> > might
> > > save some time by adding the -C option for ssh compression. If transfer
> > time is
> > > important, it might be worth setting up a scheduled rsync command to
> > copy to
> > > something on the network local to the backuppc server so you could use
> > the -z
> > > option (which backuppc doesn't support), then have backuppc pick up that
> > copy to
> > > keep the history. Or, if rsync isn't finding matching parts anyway
> > perhaps you
> > > could compress the file before the transfer.
> >
> > Just out of curiosity, are there any plans to have rsync within
> > Backuppc recognize the -z (compression) flag?
> >
> >
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