Hi Christian,

On Thu, Aug 28, 2008 at 11:24:16PM +0200, Christian Völker wrote:

> I'm trying to understand the way BackupPC works.
> 
> I'm using only rsync as transfer method.
> 
> So one of my questions regards the difference between Full vs. Inc Backups.
> 
> Does the full backup copy all files, not checking if they already exist
> on the backup target? But where is the sense then in using rsync?

The following applies to rsync only!

The difference between a full and an incremental rsync backup is that
rsync will check the whole file checksum during full backup (to guard
against pool file corruption). It will not transfer the whole file. The
incremental backup will transfer all differences since the last full or
incremental (depending on incremental level).

> Or is it the way the backup is stored?

A full backup will have a fully populated directory structure on the
server (with hardlinks to the common pool) while an incremental backup
only has the directories and any changed files (again hardlinked to the
common pool).

To sum it up: There are subtle differences in transfer (only for safety
reasons) and major differences in storage.

HTH,

Tino.

-- 
"What we nourish flourishes." - "Was wir nähren erblüht."

www.craniosacralzentrum.de
www.forteego.de

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