Is there any way to chart peak network data usage via the app or web interface?

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gobananasnet wrote:

 Is there another way or another tool? To be clear, I'm not talking about any specific device, but instead the combined usage of all devices on my network. Thanks

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No.  Traffic Meter is the only tool that Netgear provides. As you have decuced, Traffic Meter is intended to warn users when they are approaching monthly "caps" which will trigger increased charges from their ISP.

"Usage" is an ambiguous term because some types of internet connections are time-sensitive and others are not.  Streaming video, for example, requires different bandwidth depending on the quality of service.  This website has an interesting report on various streaming services: https://www.highspeedinternet.com/resources/how-much-speed-do-i-need-to-watch-netflix-and-hulu  Suppose the plan is to stream 4K video (the highest) on four TV's at the same time.  4 times 25 = 100mb/sec.  If you have less than 100mb, the video streams will stutter or lag.  (It appears you could stream 10-20 lower quality video streams with the same 100mb internet connection.)

Things like web browsing, email, downloading files, etc. are not time-sensitive.  If there is less bandwidth, then it takes longer.  If you have 200mb and start a download of a 2GB file, it will probably consume the entire 200mb, until the file is downloaded, and then consume zero until you do something else.  The point of having tremendous bandwidth is (a) to shave a milisecond off response time, and (b) to make activities complete more quickly.

So, if videos are not streaming smoothly, there is not enough bandwidth.  If you keep saying, "Dang. Web pages sure load slowly." There is not enough bandwidth.

Not what you wanted to hear.  Sorry.