I am not sure why it wouldn't be? There are a number of things you should consider. I looked at this a while back - https://blog.alexellis.io/hardened-raspberry

I am not sure why it wouldn't be? There are a number of things you should consider. I looked at this a while back - https://blog.alexellis.io/hardened-raspberry-pi-nas/ https://blog.alexellis.io/hardened-raspberry-pi-nas/ That's what made me post the link.