[Guide] Hardware Transcoding: The JDM way! QuickSync and NVENC

Newbie here. Trying to upgrade an ancient plex server. Currently using win 10 with an i7-940, 48gb ram, random video card (nvidia geforce gt 710) for display connectivity, sabertooth x58 mobo.

A buddy is giving me a prodesk 600 sff g4 with an i5-8500, and 8gb ram, with a 256gb nvme.

All of my media is in the i7 desktop, on 4 8tb red drives. My setup is automated with sonarr and radarr.

I plan on following this tutorial, but dont have a nas, and 2 of the 8tb hdd in the desktop, were setup as extended storage in disk utility. Do I need a nas? Can I use my current build to act as the storage for the media, and still have it use sonarr and radarr? How do I go about connecting my storage to the prodesk after setting it up?

Any help would be appreciated, thanks.