我了解备份密钥和用户定义的证书的必要性，但是我们是否有任何理由应该备份这些系统创建的证书？
MS_AgentSigningCertificate
MS_PolicySigningCertificate
MS_SchemaSigningCertificate34284BF7CE6208DC9D835E9F45ADD94F0757439E
MS_SmoExtendedSigningCertificate
MS_SQLAuthenticatorCertificate
MS_SQLReplicationSigningCertificate
MS_SQLResourceSigningCertificate