PC Peripherals Which UPS to buy

Hi
I need to buy a new UPS for my desktop. Will 1000VA UPS be enough?
Here are the specs for my desktop-
CPU-I73770K Stock
Graphics card-GTX680 SLI
4 2tb hard drives and a SSD
900 watt SMPS
Bluray drive
Noctua NH D14

I wont be connecting anything else with the UPS. no monitor or speakers. I only need 1-2 mins backup as the generators are used in the building immediately. Will 1000 VA UPS be enough for this?

Edit-This is the power supply
http://www.amazon.com/Antec-Current...&qid=1448993987&sr=8-1&keywords=antec+900+psu
I don't know if it has Active PFC or not.
 
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