On Wed, 2005-11-16 at 22:13, Marten van Wezel wrote:
> Well, for one, ssh + tar doesn't stream the whole filingsystem, it only
> sends files that have changed (or are created) more recently than <date of
> last backup>.
Rsync incrementals also only take new files, although this is
based on the last full, not the last incremental.
> Granted, rsync is more precise (it will detect files that are created with
> an earlier mtime, specifically files you've extracted from archives),
> however Im fairly sure that tar+bzip will be more efficient, bandwidth wise.
Even when rsync does a full, it just sends the filename list, then
exchanges block checksums over the files that already match. This
may take a long time but it uses very little bandwidth for the
unchanged files. And you can add the -C option to the ssh
command to save more. It would be very unusual for tar to be
able to do a backup with less bandwidth. For example, tar will
send a complete new copy of log files that have grown slightly
where rsync will identify and send the difference.
--
Les Mikesell
[EMAIL PROTECTED]
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