Howdy folks, I'm looking into a UPS to serve a couple purposes: the main thing is of course to give me time to shut down my PC gracefully/prevent power loss from brownouts and quick flickers. Secondarily, I'd like it to be able to maintain my fiber ONT and router for 20-30 minutes during power loss, as I work fully remote and my laptop will hold up during that time, but my internet will not. (Can't phone hotspot, limited data.)
My PC build is an RTX 4070 Super, 7800X3D, 2x2tb internal SSD, 1x 2tb external, dual monitors. My off-the-cuff estimate is a power draw no more than ~450-500 watts at peak, and usually much less than that.
I tend to over-buy for what I need, so I'm not sure if something like the APC BR1500MS2 (1500VA/900W) would be absurd overkill or not.
My other big concern is that right now my office/gaming space is in my bedroom, and I've heard tale of high-pitched whines even when the UPS is under low load (at night, the PC and monitors would be off, only the ONT and router would draw power.) It seems like these complaints are on every UPS I look at, so I'm genuinely unsure whether it's a serious concern or not. For what it's worth, I already deal with a whining monitor power supply, which I just run a fan at night to cover. So if it's generally faint from ~6 feet away, then I'd almost certainly be fine.
Anyway, does anyone have any experience with a UPS for this kind of scenario? Am I overthinking it and should just grab a decent APC/Cyberpower UPS?