I'm just speculating, but Samba might not need much CPU power and the C2 has 4 cores. So, it might work with no problems.
But the C2 is so cheap that if there are hiccups, you could just buy a second one for storage and just have the first stream from it. That would also let you put your hard drive somewhere that you can't hear it. Gotta love the gigabit ethernet, on these things!