Which of the following critical tasks should be performed prior to upgrading a server with a new installation of the latest NOS version? (Choose all that apply)

A.
You need to create a current backup of the existing system.

B.
You need to test the backup restore function.

C.
You need to shut down the server.

D.
All of the above.

Explanation:
Before any attempts are made to upgrade a server with a new installation of the latest NOS version, it is extremely important that you create a current backup of the existing system and then test the backup restore function. You will then be prepared for any issues that crop up with the new installation of the NOS version. Remember that if you do not have a current backup, you would unable to perform a system recovery should the upgrade fail. Testing of the backup restore function is equally important. What is the point of having a current backup copy if you cannot perform a backup restore function? References: Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 428-429.