An out-of-band (OOB) solution is a method of accessing and managing a server remotely without using the network connection or the operating system of the server. An OOB solution can use a dedicated management port, a serial console, or a KVM switch to provide a resilient connection while performing changes to the network configuration of the server. An OOB solution is more reliable than a VNC or RDP console, which depend on the network and the operating system, and more convenient than a crash cart, which requires physical access to the server.

Explanation
The best way to accomplish the department's goals is to transfer the existing data to an external eSATA enclosure, which is a device that connects an external hard drive to a computer using an eSATA port. This will allow the accounting department to retain the current data for quick read-write access, as eSATA provides high-speed data transfer rates and supports hot-plugging. Unlike USB 3.0, eSATA does not share bandwidth with other devices, which can improve performance and reliability. Verified References: [eSATA vs USB 3.0]

Explanation
Faulty memory and incorrectly seated memory are likely causes of the random BSOD conditions on the server.
Memory is one of the most common hardware components that can cause BSOD (Blue Screen of Death) errors on Windows systems. BSOD errors occur when the system encounters a fatal error that prevents it from continuing to operate normally. Memory errors can be caused by faulty or incompatible memory modules that have physical defects or manufacturing flaws. Memory errors can also be caused by incorrectly seated memory modules that are not properly inserted or locked into the memory slots on the motherboard. This can result in loose or poor connections between the memory modules and the motherboard.

Restoring from backup is unnecessary here as we dont know what exactly the breach affected.
Disclose incident is AFTER all other steps have been taken. The question states WHEN a data breach occurs.
Move the data to another location ... same issue. What data. Breach scope needs to be identified.
Identify the exploited vulnerability -- definitely
Disable ports and running antivirus scan between these two... antivirus should already have been running and this wasn't exactly a virus. So disable unnecessary ports is the only other option that makes any sense. Although this should have been done before this point. What should happen is that you remove the affected systems from the network but do NOT shut them off.
https://www.ftc.gov/business-guidance/resources/data-breach-response-guide-business

The chmod command is used to change the permissions of files and directories. The g+w option means to grant write permission to the group owner of the file. Since Joe is a member of the IT group, which is also the group owner of the file, this command will allow him to save changes to the file without affecting the permissions of other users. Verified References: [Linux chmod command]