I am satisfied with their service. You are looking at the personal google side. You need to look at the business side. Here is a link to G-Suite , which is google for businesses. It comes with unlimited storage, and has a low-monthly price per user, with UNLIMITED storage.
The price is only as high as $300/year for unlimited and data loss prevention, etc.
Or you can start as low as $72/year to get started.
So I believe, you are looking at the personal side where you pay for the amount of space. I use the enterprise version that has data retention in the plan (so for the most part, I trust google to keep it backed up.
However, if you wanted to back it up. I would look at automated options to back up your business drive.