How to back up plesk defintions and not the data or websites...

[AP31HR]

Hi

Plesk 10.3.1, Centos 5

I am pretty sure this is easy but can't seem to see the wood for the trees.

I am struggling to find out how to just backup the configuration of plesk without backing up individual websites (and their associated data).

So the stuff that I want to save is...
- Plesk configurations (customers, subscriptions, firewall definitions, website template, etc)
- Website structures (ie configuration files and vhost fiels)

Thanks in advance
PS BTW where are the definitions of the customers and subscriptions held?