@amadeus My experience is that NFS is faster and more reliable than all other options (for a Linux-only ecosystem). It also depends on what your concerns over security are... The weak point of most home security is usually iffy domestic modem / routers, rather than NAS protocol choice, anyway.
@mxv I have had the same experience in terms of NFS performance. So far I haven't set up #encryption or #kerberos for NFS and simply allowed my computer's IPs for NFS on the NAS. Further more a relatively restrictive #firewall is running on both my computers and the NAS. So far I have been a bit shy to start setting up NFS encryption and/or kerberos.
@amadeus If you're only connecting to the NAS from within your local network, with only a couple of people using it, then in my experience its not worth extra security measures. 99.9% of the time it's better to redirect the effort to making a second backup of the data, rather than beefing up security. ;-)
@mxv Thanks for sharing your experience. I found using NFS a bit strange from the beginning, like, you know, without username and password. But I think you're right.