On Fri, Dec 23, 2011 at 5:09 AM, Rahul Amaram <rahul AT synovel DOT com> wrote:
> Hi,
> I have a query about file transfer while taking backups. I understand
> that backuppc uses de-duplication i.e. only a single copy of the file is
> stored even if multiple copies of it exist on different machines.
> However, what I would like to know is when a file is transferred after
> being backed up once. Is it during the next full-backup? Is it after a
> certain duration has elapsed? Or is it that once a file is copied it is
> never transferred again (even for full-backup) unless it is changed?

The de-dup and xfer are mostly unrelated.  Only the rsync and rsyncd
xfer methods avoid subsequent transfers and they do it by comparing
against the previous full of the same host.  The other xfer methods
will copy everything for full backups and only files with newer
timestamps on incrementals.  On a fast local network it doesn't make
that much difference, but if bandwidth is restricted you'll probably
want to use rsync/rsyncd.

-- 
  Les Mikesell
    lesmikesell AT gmail DOT com

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