You should consider how often they will use senhasegura and how many users.
For a production server on the latest version (3.24) for a production server, a minimum of 8 CPUs and 8 GB of memory is recommended. For a POC service, the recommendation is 2 to 4 CPUs and 6 GB of Memory.
Regarding the size of the HD, you must check how long the videos will be kept on the server before the cleaning date configured in the system parameters in the senhasegura web session. By default, the images in senhasegura have a 100 GB disk when you deployed. If you want to put the POC server in production, it is recommended to increase this value.