Hello, I'm an end user like you. I think I have a possible solution for you. Yes, sadly this is a limitation for the new gen 2 cameras. As you have discovered the new cams only work with Home.Google.Com on your computer and there is not such export feature there like there is on the old website home.nest.com for the gen 1 cameras. If this is something you need to do very often then your best bet is to purchase a used GEN 1 Nest camera from eBay and solve the problem that way. It works great.
The next way to go about this given what you have is that if you are running the newest version of the GOOGLE HOME app and you have activated 'preview' mode then you can save clips in 5-minute increments to your phones photo album. But for you that probably isn't practical since you need 24 hours worth.
OK,,, so here is what might actually work for you. There is a very little known feature from google that you can access and have the system create download files for everything google has on you. (you will be surprised what is there). Go to takeout.google.com and you will see a very long list of items available. Be sure to UN-CHECK everything in the list except NEST. Then do the export. Because it will generate rather large files (gigabytes of video) Google will have to crunch on it for a number of hours. Return to that website later a you will be able to down the file. Try it first with something that is only about 5 minutes long until you see how it works.
Let me know how it goes.
