Asking this on the OpenBSD list gives it a tone: I have no background in IT security and operating systems other than Windows (I hated it less than Ubuntu, actually). I have found in the archives that in general you can recommend OpenBSD to anyone without any background to start tinkering with. So, there might be no benefit of a learning curve of FreeBSD --> OpenBSD, as I, may have wrongly guessed?
What I'd like is a secure wireless router and a file server (for my mobile devices in the first place, really). Many suggested the PC Engines APU board here. Check. Can it handle both roles, router and file server, or, is it a good idea to have one device for these 2 roles in the first place? It would encounter very modest load on both of its roles. I have no intention whatsoever to run any x86/amd64 desktop software on NIX in the post-PC world (in the desktop space, really). It would also be an interesting side-note on how do you see the future of (NIX on) desktop PCs (already a dead market as and old post here suggested), or embedded/ARM mobile devices and NIX, perhaps other than iOS/Android derivatives of the latter. But the main point of my question is, the server. Thank you.