Questions with rsync

[gmspro]

--- On Sat, 6/6/09, Mail Lists <lists at sapience.com> wrote:

> From: Mail Lists <lists at sapience.com>
> Subject: Re: Questions with rsync
> To: "Community assistance, encouragement, and advice for using Fedora." <fedora-list at redhat.com>
> Cc: "GMS S" <gmspro at yahoo.com>
> Date: Saturday, June 6, 2009, 6:18 AM
> On 06/04/2009 06:28 AM, Steven Stern
> wrote:
> > On 06/04/2009 12:53 AM, GMS S wrote:
> >> mv backup.8 backup.9
> >> mv backup.7 backup.8
> >> mv backup.6 backup.7
> 
> 
>   Have you tried rdiff-backup ? It will do all this
> for you ... and its
> as easy to use as rsync alone.

Do rsync and rdiff-backup have the option of compression.
I think they just copy the files.
Is it possible to backup 20GB partition into 8GB or below 8GB using rsync or rdiff-backup?