Q:

Safely shutting down 19V mini PC when power fails

I am adding an Intel NUC (4"x4" i5 PC, 12-19V, 10A@19V) to my guitar effect pedalboard for all kinds of fun signal processing with Ableton Live and Max/Msp. I'm building a 12V 20A power supply using this for all the pedalboard's 5,9,12V electronics.
My goal is to get the PC to safely shut down when I unplug the pedal board from the wall using this. I assume this shutdown sequence will take about 5-7 seconds, and will no doubt need some sort of supplemental power source (battery? capacitor?) to keep it running during that time.
I was looking at universal 19V laptop batteries but then I have to take charging into account, source switching, added weight and space, etc. I'm am interested but inexperienced circuit designer, for example having just learned how to regulate those 5&9V circuits with regulators and capacitors. Of course it would be great if there was a simple product available that could take care of some or all of this task.
Thanks!

A:

After a lot of research I ended up going with OpenUPS and six 18650 Li-FePO4 cells. Results are really terrific and the plug/startup, unplug/shutdown sequence is working really well. I'll post back with a forthcoming run-through on my blog for future reference.
Thanks!

