Try fetching only your photos in one archive, your Gmail in a separate archive, and then everything else in a third.

If you have "too many" Google photos and that archive fails, create albums for every year, and only download a year/album at a time. It's a huge PITA, but at least you'll get your stuff back. (Kinda: depending on how you uploaded your photos, the metadata may come back truncated or altered).

Hmm, which part fails? Works great for me. You can schedule it to happen every 2 months for a year. And so every 2 months I get an email with links to 7 or so 50GB .tgz files. They download very quickly with no throttling and fully saturate my 1Gbs connection.

I've been getting mine as a large-ish (16GiB) TGZ type file for many years.