Why not just pay for google photos?

Is there any convenient way to back up Google Photos to Backblaze or S3?

There are afew projects on github that let you configure an API key for google access and pull your photos, without using takeout. https://github.com/dtylman/gitmoo-goog https://github.com/gilesknap/gphotos-sync

I run one on my wife's account with a cron job to grab new photos daily.