How to clone a NC installation?

[dred]

could you provide more notes / explanation on your commands?
Im just trying to rescue / clone my old nextcloud installation as written here:

Nextcloud migration from dead server

I guess all hard drives of the old server are still running, so you have access to the nextcloud folder, data folder and theoretically database, which was also mysql/mariadb before? So the nextcloud and data folders can just copied over. To set nextcloud into maintenance, you can manually change the related line in you nextcloud/config/config.php before accessing nc on your new machine. About the database I am not too sure how to get all that data inside safely to your new machine, as you cann…

any help appreciated!