To protect the server from being physically accessed when I am not in the building the device I should use is the server security door which can only be accessed by authorized personnel.
This security door varies from a simple manual locking system to electronic controlled security system. When you rent a space in a company's data center, it is very important to provide a security system, therefore only authorized personnel can gain access to your server. For a simple security system you can use manual locking with keys. But for a more secure system, a security system with access card and electronic locking and alarm system will be better.
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