Thanks for the link.
<sigh> I'm just really confused. Like you say, it says Google One backs up MMS and photos and videos in original quality. But I already have that with Google Photos (minus MMS which I don't care about). I'm on a paid Google Storage plan, you?
Also, even though I got that message about the backup being 6 days old earlier today, when I just now went into Google One, it said last backup performed 21 minutes ago, even though I ignored that warning message earlier (I always ignore it and just dismiss it).
Regarding quality of photos backup, like I said, I've already been backing up in original, uncompressed quality anyway, which counts towards my storage, as opposed to "high quality", which doesn't. To further the confusion, I'm also benefitting from the old perk when I bought my phone which is that (regardless of if I have a paid storage plan or not) my photos will keep being backed up in original quality without a storage limit being imposed until January 2021.