mirroring packages without much bandwidth overhead

[Andreas Bartelt]

Hi,

is there a simple way to efficiently mirror packages solely based on 
package filenames in order to reduce bandwidth overhead?

I've tried to do this with rsync but as packages are constantly rebuilt, 
file size of packages changes regularly, and, therefore, the rsync 
option '--size-only' (which ignores timestamps) is insufficient for my 
purposes. I'd like to sync packages solely based on their file name. Is 
there a way to do this with rsync or with another tool?

regards,
Andreas