Why do I need to clone a B-Translator server? An obvious reason is to have a backup server. In case that something goes wrong with the main server I can quickly switch to the backup server, until I find and fix the problem.
A clone can also be used for testing. Before applying something on the main server I can test it first on a clone/backup server.
Another reason for cloning can be load-balancing. It is possible to keep several clone servers synchronised with each-other, and then the work can be shared between them with a load balancer. I haven't tried this yet, but I think that it should work.
It can be possible and even simple to make identical clones just by copying the physical disk or the filesystem. However I prefer to build a new server from scratch and copy only the relevant data from the old server.