Default Nfs back up help

Hello,
So I wanted to back up my nfs so that I can be safe when flashing roms and other stuff, so I went to Google and searched but I couldn't find a way to back up my nfs, can someone please provide me the an easy way of backing up nfs?

I Flashed DN3 and in the aroma installer it had an nfs backup option, even though it might have backed up, I wanna be more sure by backing it up myself.

With Regards,
Overdub

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Smack the thanks if I ever help you.
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