Ok, i finally finished it. My true NAS build. Previously i had "beefy" Dell FX160 with 2 core 4 threads Atom 330, 3GB ram and 500GB 2,5 drive which run pure debian on 2gb flash disk.
Now i have:
Mobo:Asus E35m1-l, 6xSATA III, PCI-E x16
CPU: (embeded) AMD e-350 2 cores 2 threads 1,6GHz, 15W TDP
Ram: Kinstrone 4GB DDR3 (max 16GB)
PSU: (TFX) Delta 250W bronze
Chasis: Compaq CQ1120UK
disk chamber: Chieftec CMR-625 5,25" chamber for 6x 2,5" drives
The only new item is disk chamber (about 40$). The rest parts are used, bought from allegro (Polish ebay). PSU is from other case (8cm taller and deeper Viglen Genie SFF computer). Asus mobo didnt have backplate (shame!). Compaq case was the cheapest and smallest case with full 5,25 chamber i could get. Many others come with slim chamber which offcourse didnt have place for 6 disks. Unfortunately case didnt have window for TFX PSU - originally compaq mainboard was powered directly from some external psu. I was thinking about buying Pico PSU from alliexpress for about 15$. But i would also need some external PSU which would be another cost. So i just cut the window for my Delta TFX PSU. TFX'es are cheaper and very easy to get. Yeah, i know the cut is not stright. Its because of case rivet which wasnt flatten enough. I also had to grind down a little bit plastic front near 5,25 chamber because i wont be able to open two last disk shelves.
Im using now 3 disks 160GB for OMV and 2x500GB in mirror raid for data and still have 3 free shelves for futue expansion. Tere is also place for another disk under 5,25 bay so i will put there my 160GB when i will want to fill all shelves on my chieftec chamber with data disks. As i mentioned before mobo has PCI-E x16 slot. But as you can see there is very little room for expansion card. I dont need any PCI-E device right now (maybe some 4 port Intel NIC?) so it doesnt bother me much
I use torrents, samba, nfs and syncthing as cloud unlimited-space replacement for my Dropbox, GDrive and Mega accounts. Well im still using Mega for some very recent stuff. OMV shutdown plugin turns the machine off when there is no connections to it. My current router and cable modem are controlled by some cheap digital time switch. When i replace router with Mikrotik (which i need to buy anyway) it will also WOL my NAS at the start.
I also ordered 8cm of luminescent sticky tape to replace this ugly yellow paper scrap Space under my desk is really dark place xD
So yeah, so far im really happy with this setup, its little power consumption and overall cost.
PS. Sorry for any language mistakes, im from Poland.