Our main data center goes down due to a cyber attack, and the backup site will take 4 hours to come online. How do you prioritize which trading and risk systems to recover first?

我们的主数据中心因为网络攻击宕机了，备用站点需要 4 小时才能上线。在这 4 小时内，你如何决定优先恢复哪些交易和风控系统？