What is the difference between complete and partial deinstallation of the 42goISP system?
Partial deinstallation means that only the 42goISP system itself will be uninstalled, not the objects created by it (webs, users, DNS records, etc.).
On complete deinstallation also the objects created by the systems (webs, users, DNS records, etc.) will be uninstalled. Thus, the server is reset to its original state.