I need to get a replacement UPS. I have only ever configured mine to immediately issue a clean shutdown after more than 5 minutes outage. That said, I think my previous UPS (APC Back-Ups BE550G) is underpowered at only 330watts/550VA. I say this because I just ran NewEgg's psu calculator and it estimates my system draws ~380watts. Does this mean that my BE550G isn't actually protecting my system, or am I not understanding the VA/watts, runtime till shutdown, or other parameters? If that's the case, how do I estimate how much VA/Watts I need out of a UPS? Again I'm just looking for bare minimum protection so my system has time to do a clean shutdown when needed.
Any clarification would be appreciated since I'm really confused by all the similar specs out there and varying prices. I'm on a very tight budget and hope to spend the minimum on this (which would be a replacement battery for my current UPS).
Thanks in advance!