How to access a disk in the Docker container itself

How to access a disk in the Docker container itself? The disk and partition are displayed by running the Linux command “lsblk”. How do I find out the path in the container to this resource if the path in the host system (Linux Ubuntu 20.04 LTS) is “/media/[USERNAME]/[HDDDESCRIPTION]/”?

I need this path for nextcloud backup customizing.

Thanx in advance and greetings,
Coleman

Can you elaborate, why you think a container should be able to access a block device as device?
Are you familiar with volumes in Docker?