It's a good idea to store your private keys in the cloud, even though you camouflage the file as something normal like shopping for photos on the keys and hiding the photo in a large folder of holiday photos. Your recent or something
I think if you maintain the proper security for your cloud storage account using passwords and it is difficult to compromise with whatever you are hosting there will be safe.
If you think that if you save a private key with Google Drive and if you think Google itself may see your private key, it is wrong.
Keep in mind that google drives will close their services for next year, I think the services of all cloud services are safe, but in the end they will become very commercially fast, I do not trust the cloud because many cases are happening due to the influence of various conditions. I'd better backup data manually and more than one device.
google drive isnt closing, they are getting rid of the windows app that automatically backs up your files.