Hi Dennis,
In some cases yes, but this really depends on the recover objective of your servers. An example of when you would want to use system state protection for a non-domain controller server would be a web server running IIS. System state is going to protect IIS
components as a part of the system state. Note that you would still need to protect the website directories on an IIS web server outside of the system state backup. Here is a good tutorial on System State:
http://www.datamills.com/Tutorials/systemstate/tutorial.htm
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