Originally Posted by Celery
In that case I would suggest some form of Linux.
More than that...
Old tower power draw ~250w? Price per kW = £0.15
Per day you'll use 6kwh of power at a cost of £0.90
Over a year that is £328.50
Get a raspberry pi. Or an plumed A20 or a banana pi, etc,
5w draw. 0.12kwh per day at a cost of £0.018 per day. Or £6.57 per year to run.
You can attach sats drives directly to the plumed and banana pi boards. (You'll need a usb enclosure for the pi).
You'll end hp with a nicer, quieter, less power hungry cheaper to run device by just throwing your tower out!