rsync backup size

[Hal Burgiss]

On Wed, Feb 18, 2009 at 12:32:01AM -0700, Robert Holtzman wrote:
> 
> 2. Running "du -ach /media/disk" showed ~8 Gb (the backup is the only 
> thing on the disk). Running "du -ach /" (with the usb disk removed) 
> showed ~6 Gb. Why is the backup larger than the system, especially 
> since I invoked the z option and was careful to exclude /media?

If the filesystems are not the same on both end, there may be
different block sizes which can cause a "waste of space", especially
if there are a lot of small files. This can cause discrepancies.

-- 
Hal