Cheap NAS Operating System for Old / Slow Hardware

[Rekcut722]

Are there any NAS operating systems to create a NAS for just home network access with anywhere from 4+ tb of storage. Free NAS is out of the running because of how much ram it needs (8gb base + 1 gb per 1tb of storage), and unraid won't work either simply because it's too expensive and is far too complex for my needs. Would the windows baked in "nas" functionality work for my use case, connecting a Mac or PC, or even phone if possible, to it to either stream of copy media off of it? Thanks for any help!