I found brand new EATON 9130i Rack Mount 2000 VA 1800 Watt UPSs with 2 yr warranty on eBay for $400. Can't beat that.
So you can put one miner on a UPS. You have also increased its ROI time by 3 months. Thats like 1700 hours of hashing to pay for the UPS that will in its lifetime prevent maybe 6 hours of downtime?
I am so not understanding where you people think this is a good idea? Its like you are looking for ways not to ROI