What storage type suggested for ERP system documents?

I’m working on ERP system for small manufacturer who dealing with medical devices. I thinking about what is better for store documents. The company wants to store their drawings and documentations in this system, so they are pretty sensitive information’s. I thinking what type of storage is better for my needs. I give you some of my thought, but I’m interested some pro guys opinion about it:

Option 1 - Block storage: In this case I would use nginx as web server with it’s “http_auth_request_module”. than write an auth. endpoint in my back-end, so nginx would ask authentication for my back-end before serve the documents. It looks pretty safe for me. I can add further encryption to the block storage like on this article: https://www.digitalocean.com/community/tutorials/how-to-create-an-encrypted-file-system-on-a-digitalocean-block-storage-volume#conclusion I also can make backups really easy creating a snapshots. However it is more expensive than object storage, I can attach it only 1 instance (right now it is enough, but I don’t know maybe there will be another use case) and maybe object storage enough for me.

Option 2 - object storage (spaces): In this case I don’t need nginx, I can make the storage private and handle permissions with the DO api and my back-end. It is cheap, but I don’t know is it safe enough? The other thing can I trust it to not make backups? If not then how to make backups anyway?

Could please share your thoughts with me about it?