I will be investigating something like that … a bit of a different tack to the Pi route (vastly more expensive), but seeing as I am building a NAS for multifunctional use anyway (Home media, backup, extra cores for distributed workloads). Based on this line of boards : SUPERMICRO X10 allows some pretty killer system builds, although at a price.
Xeon D chips, the six core option draws 35W (eight core 45W), benchmarks like a top of the line laptop i7, and has 10Gb ethernet… can achieve 10us latency and max out a SATA RAID bandwidth over my home network (bottled by the internet connection for Safe). Safenet should run easily on one core with tons left for all other uses. Will let everyone know how it works. Definitely not the best cost/benefit unless you count adding Safe as ‘free’ because the hardware was already going to be there.