Error to mount backup "0600" permission issue

Try changing the permissions on your mount point (whatever that is) to 0755 (-rwxr-xr-x) and the ownership to root:root and try the mount again.

Don't forget that you must be root to use the mount command:

sudo mount /dev/<device> /the/path/to/the/mount/point

You also have to make sure that /the/path/to/the/mount/point exists and is empty before you try to mount a volume to it.

I'm assuming this is what you're talking about…

-- sw

Thank you very much for your time :)

but my volume is not empty

Mounting a volume does not erase it. The mount point directory you create in your file system to receive the mount must be empty. The device you mount does not have to be empty.

— sw