datahoarder
Who are we?
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
We are one. We are legion. And we're trying really hard not to forget.
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You say that data is critical for your business, have you considered a cloud backup as well? AWS has very cheap storage options depending on the speed the file needs to be available at. Also I’d definitely not go with flash memory, bit flips can be a real danger. I’d go with a 1 TB HDD in an enclosure, additionally to a cloud backup
OP already says that multiple backups and cloud copies exist. I do not recommend mechanical hard drives because they're inherently fragile. If OP really needs high-quality long-term archival storage that is robust and lasts forever, I will recommend a tape drive and do so with a straight face.
Bit-flipping is, frankly, a non-issue to such an extent that even considering it seriously is moving into tinfoil hat territory.
Google Drive does not count as cloud backup, especially for something business-critical.
On its own, no, but it can be used, like any cloud storage solution, as part of a robust backup strategy. Particularly, if the desktop sync feature is enabled, every client machine that has the sync application installed will download and synchronise the contents of the Google Drive locally. If the Google Drive servers go kaput this still means you've essentially got several off-site backup copies of the data on Google Drive.