The amount of security you need to protect your systems depends on several factors, including:

1. The value of the data and systems you are trying to protect. The more valuable they are, the more security you need to protect them.
2. The likelihood of an attack. If your systems are more likely to be targeted by attackers, you need more security measures to protect them.
3. The regulatory requirements you need to comply with. Depending on your industry or location, you may be required by law to have certain security measures in place.
4. The potential impact of a security breach. If a security breach could have a significant impact on your organization or customers, you need more security measures to reduce the risk of a breach.
5. Your budget. The amount of security you can afford will also influence the level of protection you can implement.

In general, it is important to have a comprehensive security strategy that includes a combination of technical, administrative, and physical controls to protect your systems and data. This might include firewalls, anti-virus software, intrusion detection and prevention systems, access controls, regular backups, employee training, and physical security measures such as surveillance cameras and restricted access areas.

It is also important to regularly assess your security posture and make adjustments as needed to stay ahead of evolving threats and vulnerabilities.

To determine the appropriate level of security for your system, you can follow these steps:

1. Conduct a risk assessment: Identify the assets you want to protect, the threats that could harm them, and the potential impact of those threats. This will help you prioritize your security efforts based on the risks that are most critical to your business.
2. Determine your security objectives: Define what you want to achieve with your security measures. For example, you may want to prevent unauthorized access to your systems, protect sensitive data from theft or loss, or ensure business continuity in the event of a disaster.
3. Develop a security plan: Based on the results of your risk assessment and security objectives, develop a plan that includes specific security controls and measures you need to implement. This plan should address both technical and non-technical controls, such as employee training and physical security measures.
4. Implement your security plan: Install and configure security measures based on your plan. Ensure that all security controls are properly implemented and integrated to provide comprehensive protection.
5. Test and monitor your security measures: Regularly test your security measures to identify vulnerabilities and address them promptly. Monitor your systems for suspicious activities and review logs to detect any potential security incidents.
6. Continuously improve your security posture: Stay up-to-date on the latest threats and vulnerabilities, and update your security measures accordingly. Continuously review and adjust your security plan to ensure it is effective and aligned with your business needs.

By following these steps, you can determine the appropriate level of security for your system and implement measures to protect your assets, data, and business operations from potential threats.