> (in reality, the mirror were not at the same host,
> it is just I didn't use various host for the
No point in having a mirror on the same host. All links should point to one
host and DNS rotates requests to one mirror.

> I modified the file /etc/hosts, I will try to mirror
> this website and modify each links. 
Httrack only creates relative links on mirrored pages. Nothing to modify.