We now know where all the important files that hold a Proxmox cluster together are placed. We will go inside some of these files for a better understanding of what they do and what command arguments they use. You can use any Linux editor to view/edit these configuration files. In this book, we will use #nano to view and edit configuration files.
During the learning process, it will be a good idea to make a backup of the configuration files before editing them. In case something goes wrong, you will be able to replace it with the original working configuration file. Simply copy the configuration file using the following command:
# cp /etc/pve/<config_file> /home/<any_folder>We can also use the SCP command to back up files to another node:
# scp /etc/pve/<config_file> <user>@<ip_or_hostname>:/<folder>