The goal
Replace an aging file server, running a 800MHz P3 processor, with a reliable, cheap and quiet server that does not waste power.  In addition I wanted to add power backup as I have previously been forced to restore a backup after a power outage corrupted the drive.

13/1/13  Update:   This project has been extremely successful.  It has been in operation since it was created, with a 100% uptime and I haven't taken the lid of to "Improve it"   (Very unusual for me and I bet many in the instructables community).

The Concept
Build a Raspberry Pi based server, with a large HDD, power supply and battery backup into a small form factor case.  In addition I want to use recycled or salvage parts where ever possible.

1.  Raspberry Pi.  I got a case, this is not required, but does make mounting easier (Purchased online)
2.  Suitable Case  (local salvage shop)
3.  Either USB Hard drive 
     or Hard Drive & USB to IDE/SATA adapter (local computer store)
4.  DVD ROM (Optional)
5.  Sealed Lead Acid Battery(s)  12,18,24V  3-7Ah  (2x12V, 3.4Ah in shed)
6.  DCDC Inverters - Adjustable
     12V version - 2x Step-Down 3A,  1x Step-Up 2A (Online)
     18-24V Version - 3 x Step-Down 3A (Online)
7.  1x each, USB extension, Ethernet extension, RCA to Phone (Assembled)
7.  Power supply = Battery Voltage x 1.3 + 1,  2A  (from old Laptop, Printer etc.)
Misc.  Various Cables, Electronic components and Screws  (all recovered from the salvage box in the shed) 

Step 1: Time to Start Stripping

You could select almost anything for a case,  an old CD or DVD player, VCR etc.   In my case,  I selected an old Panasonic CD Player that  I picked up for a couple of dollars from the local salvage store.

The first job is to strip out the bits you are not going to use to provide a blank canvas.
<p>Hey many, nice one, but.... how you connected that DVD-ROM to USB/ATA converter and power supply cable?</p>
<p>The converter had a ATA header that plugs directly to the DVD. HDD connected via a short SARA cable that came with the converter. The converter is powered by the USB from the Pi, but both drives are powered by the main PSU.</p>
<p>Yup, I see. I did something like this, but with cubietruck. Good job and thanks for idea :)</p>
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You should add a little fan, or maybe a water cooling system, or better a liquid helium cooling system!!! You could make it smaller, but it's cool
Just updated the instruct-able summary. <br>Reliability has been100% since built. if fact its so good I haven't even taken the lid of to &quot;improve&quot; it. <br>Cooling is not a problem. Still passive, without ventilation holes, and it consistently runs at 11 deg C over room temp.
Cool... Thought of using an old low profile &quot;AT&quot; case.
I thought that too, but I could find one small enough, at the right price. Was also looking at a UPS case, solves all battery mounting issues, external fuses and more. Problem is it still goes so could not justify it.
Do you think that there is a need for a cooling fan?
At only 15 Watts, it should not need active cooling, in the worst case it would only need vent holes. Mine does not have vents, but I'll watch it as we get closer to summer. Maybe something to consider when selecting a donor case.
You can drill some holes at the top of your case and install a fan if you think that it is going to be necessary. You could use step drill bits to make nice round holes on your case.<br> <br> <div class="media_embed"> <a href="http://www.flickr.com/photos/chadmagiera/6977793623/" rel="nofollow" title="step drills from grizzly_02 by chadmagiera, on Flickr"><img alt="step drills from grizzly_02" height="500" src="http://farm8.staticflickr.com/7064/6977793623_bd059e5cbc.jpg" width="375"></a></div>
I have updated the last step, with thermal images. <br> <br>Don't want a fan becouse that would create noise and this is a &quot;Silent&quot; server. Stepped drill bits are really cool, but soooo expensive.

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