So that it is also clear on what kind of system my FreeNAS Installation is running. Small, quiet and sufficiently powerful: HP N36L Proliant Microserver (meanwhile there is the N40L, which brings a bit more CPU clock). Besides FreeNAS as operating system, Windows Homeserver or vMWare ESXi (both are officially supported by the device) would also work. Now I let the video speak for itself:
For FreeNAS 8.3.0, the successor, the HP N54L Microserver...on. Available as a basic device for under 200,-€, a solid home server system with sufficient storage space can be put together for around 500,-€.