The power supply and the hard drive are two components that can most likely be swapped out while the server is still running, if they support hot swapping or hot plugging. Hot swapping or hot plugging means that the device can be added or removed without shutting down the system. The operating system automatically recognizes the changes that have been made. This feature is useful for minimizing downtime and improving availability. The CPU, the GPU, the cache, and the RAM are not hot swappable and require the system to be powered off before replacing them. Reference: https://www.geeksforgeeks.org/what-is-hot-swapping/ https://www.howtogeek.com/268249/what-is-hot-swapping-and-what-devices-support-it/

RAID 6 Disk Striping with Double Parity
The RAID 6 design distributes data across a minimum of four HDDs the same way that RAID 0 and RAID 5 do, but it also distributes parity information across two disks. The result is that a RAID 6 array can recover data even with the failure of two HDDs. Reads are quick, like RAID 5, but writes are slower due to the duplication of the parity data. It is a good general solution as long as the performance hit on write tasks is not a problem for your environment.
RAID 6 requires a minimum of four HDDs.

The best policy to deter a brute-force login attack is account lockout threshold. A brute-force login attack is a type of attack that tries to guess a user's password by trying different combinations of characters until it finds the correct one. This attack can be performed manually or with automated tools that use dictionaries, wordlists, or algorithms. An account lockout threshold is a policy that specifies how many failed login attempts are allowed before an account is locked out temporarily or permanently. This policy prevents an attacker from trying unlimited password guesses and reduces the chances of finding the correct password.

Explanation
The hosts file is a file that maps hostnames to IP addresses on a server or a computer. It can be used to override or supplement the DNS (Domain Name System) resolution for certain hosts or domains. If the hosts file is misconfigured, it may return a different IP address for a hostname than the one registered in the DNS server, causing connectivity issues or errors. Verified References: [Hosts file], [DNS]

Explanation
The top portion of the dialog box lists the users and/or groups that have access to the file or folder.