where the images and attachments are saved in odoo

Good afternoon friends,

I wanted to know where the attachments that are uploaded to odoo are saved and where the images of products, customers, etc. are saved.

all this with the intention of taking backup of these files to be able to restore them later.

And if there is any complement that redirects the content of the attachments and images to a cloud server. like aws or other cloud provider.

thank you very much to all.

Greetings.

release odoo: 12