rsycnc copies all files

[Gareth]

Wayne Davison wrote:

>On Wed, Jun 16, 2004 at 08:26:33PM +0100, Gareth wrote:
>  
>
>>I am making an extraordinary claim: rysnc seems to copy all my files, 
>>not just ones that have changed or new files.
>>    
>>
>
>Use either -t (preferred) or -c (slower).  See also -a.
>
>..wayne..
>  
>
Wayne... Thanks for the reply.

The man pages say -c passes "always checksum" - I thought the whole 
point of rsync was to checksum the differences between source and 
destination files. The many examples / tutorials I've found from 
Googling do not show the use of the -c for rysnc to be effective. (For 
example.... 
http://www.devshed.com/index2.php?option=content&task=view&id=56&pop=1&page=0&hide_js=1 
)

Is the -a option typically used by most users of rsync?

Many thanks


Gareth