How to copy/duplicate an existing vserver
It seems quite easy:
1. The data directory of the original server is under /vservers, its configuration tree under /etc/vservers . These need to be copied with a new id (/etc/vservers/debian_1 > /etc/vservers/debian_2 und /vservers/debian_1 > /vservers/debian_2)
2. The config files of the new server need to be modified. You have to put in a new ip, new hostname, new domain name, new context id! and relink the run symlink to a pid file named like the new server and you need to relink the vdir to the right directory.