Rsync is a program.   You can run it once an hour, once a day, or once a
week etc... depending on your needs.   The main point is that it does not
transfer a file unless that file has changed at the remote site, thus
keeping bandwidth down to a bare minimum.   It can also be instructed to
compress the file transfer if desired.

I was sceptical at first, but my experience has been very positive with
this method.

Regards,

Jon

On Mon, 25 Mar 2002, Anderson, David wrote:

> Hmmmm....Does "rsync" refer to a product or methodology?  Does "rsync" mean
> that it has an image some place else (like a matching server at a major
> corporate location)?  Generally, directory and file synchronization is big
> overhead, especially if you are migrating every change (as opposed to a
> scheduled event) across the link.  This kind of thing usually means that
> other applications that have to use that link are degraded, sometimes
> seriously.
> 
> David Anderson
> Scripps
> 
> -----Original Message-----
> From: Richard Hellier [mailto:rlh AT lsil DOT com]
> Sent: Monday, March 25, 2002 12:55 PM
> To: Anderson, David
> Cc: 'veritas-bu AT mailman.eng.auburn DOT edu'
> Subject: Re: [Veritas-bu] RE: Backing up lots of small remote sites.
> 
> 
> Folks,
>       Can I throw in my ten cents' worth? What we do to backup smallish
> sites
> is to use the
> "rsync" software across a WAN (or VPN) link to send down each day's
> "deltas".  The initial sync
> takes some time, of course, but can be achieved by shipping disks
> (rather than tying up the link
> for a week ...).
> 
>       The savings are:
> 
> * No local admin staff needed to change tapes
> 
> * No library / tapes needed at remote site
> 
> * DR procedures are greatly simplified
> 
> * Restores can be speeded up since the required files are
>   "spinning" on your disks at the central site and so can be
>   turned around without needing tapes!
> 
> * Large economies of scale are possible by spending the itty-bitty
>   amounts from the remote sites on a humungous library (ies) at the
>   central site.
> 
> * A few staff can manage lots of sites once the framework is in place
> 
> Cheers,
> 
> Richard.
> 
> 
> 
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