# Frequently asked questions Quick answers about OpenNCCM. Source: https://docs.opennccm.com/en/ayuda/preguntas/ ## Is it free? Yes. OpenNCCM is free software under the GPL-3.0 license: you can use, study, modify and share it without paying. [Professional support](https://docs.opennccm.com/en/ayuda/soporte/), when available, will be a separate service that does not limit any feature. ## Where do my configurations live? On your own server. OpenNCCM is installed on your Ubuntu machine and stores configurations encrypted with AES-256 in its database. Only what you turn on goes out to the internet: CVE lookups to NVD, alerts by email, Teams, Slack or Telegram, the [AI assistant](https://docs.opennccm.com/en/consola/asistente/) provider or the [Git copy](https://docs.opennccm.com/en/administracion/sistema/). ## What system do I need? Ubuntu Server 22.04 or 24.04 LTS, 64-bit, freshly installed. 2 vCPUs and 4 GB of RAM are enough for about 300 devices. Details are in [Requirements](https://docs.opennccm.com/en/instalacion/requisitos/). ## Which devices can it manage? 131 platforms from about 70 vendors, over SSH or Telnet. Any other device with SSH can be managed with the generic profile. Full list in [Supported platforms](https://docs.opennccm.com/en/referencia/plataformas/). ## Do I need to install anything on the devices? No. OpenNCCM signs in over SSH with a device user. It is only worth setting up [syslog](https://docs.opennccm.com/en/primeros-pasos/syslog/) so changes are detected the moment they happen. ## What happens if I lose the encryption key? Without `/etc/opennccm/secret.key` the backups and stored credentials cannot be read. Keep it separately along with the [recovery backups](https://docs.opennccm.com/en/instalacion/migrar/). ## How do I upgrade? From **System → Update** or the new-version notice. A backup is taken first and, if the new version does not respond, it goes back to the previous one by itself. See [Upgrade and roll back](https://docs.opennccm.com/en/instalacion/actualizar/). ## Where can I get help? In [Community and support](https://docs.opennccm.com/en/ayuda/soporte/).