My system is: http://ark.intel.com/products/56413/Intel-Server-System-P4308CP4MHGC

 

• Dual 750W redundant power supplies
• Dual Xeon E5-2630v2 CPU
• Up to 16 RAM DIMM (currently 8)
• Up to 8 7200k SATA HDD (current 5 + 2 SSD)
• 1x DVD Drive
• 3x PCIe Cards; SoundBlaster, 4 Port USB 3.0, ATI FirePro 2460 Quad MiniDP

Only need UPS to support shutdown of system (enough time to save VMs state) and possibly UFB ONT (~15W consumption) / HG659 (<24W consumption) router for the same amount of time to send alerts etc.

I'm currently looking on PriceSpy so should I be safe to go for a UPS rated for >800W and up to around 10min (less for lower wattage)?

Also looking at: http://www.pbtech.co.nz/index.php?z=p&p=UPSBLZ02200&name=Blazer-II-2200VA1100W-Line-Interactive-UPS--12V9Ah