What occurs if the user takes a backup of the 3CX installation with options including the License Key and FQDN?

Taking a backup of the 3CX installation with options that include the License Key and Fully Qualified Domain Name (FQDN) is essential for maintaining the integrity of the system during restoration. When the backup is generated with these options, it ensures that the license configuration and domain settings are captured.

If the user attempts to restore from a backup that includes both the License Key and FQDN, it may lead to complications during the restoration process if there are discrepancies with the new environment. Specifically, if the license and domain do not align with the new system settings, it can cause the backup to not restore properly. This is due to potential conflicts with the licensing and network configuration that the system expects, which can result in operational issues.

Therefore, C is the correct answer, as taking a backup with the license key and FQDN is crucial for accommodating a change in the FQDN. Option B is not correct because the restored system would require alignment with the existing license and domain. Option D is not correct, as the process doesn’t inherently prompt for a new license key; rather, it uses the one provided in the backup.