When the hard drive damage, go to [Settings > HDD Management > Space Management] and we can see the status became Unsafe. Please follow these steps to replace a HDD.
In ITE2 NAS [Settings/Network Management] Page, You can set up IP, Wi-Fi, and DDNS settings for you ITE2 NAS. [IP settings] and [Wi-Fi settings] is based on the network settings in Windows 10. [DDNS settings] is the special feature, when you are in external network, you still can access files by a unique URL.