Macbook, screen broken, external monitor does not show data - how to perform a backup "blind" typing

Hello, community.

Unfortunately, my Macbook dropped from a chair and the screen is broken.

I can see (while flickering) the login screen and can log into MacOS. Afterwards, the screen turns black, the external monitor does not show anything, to.

How can I perform a backup of the system to the iCloud by only using the keyboard (e.g. launch the terminal and enter the code for starting a backup to iCloud)?

The data stored on my Macbook is not of interest, but the installed applications etc.

So, a full backup of the system (1:1) would be of interest for me - by using the terminal in "blind" mode.

Does any one of you have experiences with this and maybe can assist me with the necessary code to enter into the terminal?

Thanks a lot.

.:. lutz