Well G Suite deals in academia allow for unlimited storage. If you use the official tools they will throttle you, but if you use something like rclone https://rclone.org/ you can sometimes circumvent these limits.

When I was researching using a tool which leveraged a similar system and talked to a university which had backed up literally a petabyte of data to a single drive account.

Google's vague terms of service in terms of their "unlimited" storage is just a mess on both sides.

Like all cloud storage at the end of the day, if you're a paying customer or not, there are no guarantees you'll ever be able to retrieve anything once its off your infrastructure.