How are files stored in the cloud?

Question

Data storage

How files are stored in the cloud (dropbox, gdrive, Yandex disk), they are located in a special database or distributed file system. Maybe even how?
I understand that everything is distributed across servers and so on. but if you take one cloud server spherically in a vacuum.

Answer 1

Check out this thread - quite an interesting analysis of dropbox.

Answer 2

They can be stored in different ways, depending on the implementation of a particular service.

Answer 3

Maybe the materials of their reports are suitable.