> Also the number of bytes saved is the same size as the 
> original complete site download, so it seem it will 
> redownload everything every time...
> here is a log extract : 
> 58 seconds : 4303 links scanned, 3608 files written 
> (207624512 bytes overall), no files updated [206614087 
> bytes received at 172465 bytes/sec]
> (14 errors, 0 warnings, 3590 messages)

Hum, a lots of data was transfered: Were all files really 
static files ? I suspect the site not to be able to fulfill 
update requests - can you give the URL of this site please ?
(Note: the "no files updated" is bogus - this is a display 
bug that is fixed in 3.33-RC5)