The specification should state which components run locally, which connections are allowed and who can administer the system. A local installation does not automatically make every service offline: backups, monitoring, updates and optional integrations also need to be addressed.
Hardware depends on the model, document volume, response expectations and number of people using the system at the same time. We scope that before quoting an appliance or server.
The handover covers access, backup and recovery arrangements, updates, support and responsibility for ongoing operation.