Debian Based Installation For Debian based systems, please add the following information to your system. To configure the repository, you will need to setup the Proxmox release key first. On your server, get the key from the following site below: https://enterprise.proxmox.com/debian/proxmox-release-[debian version].gpg Once you have the key on your server, move it to /usr/share/keyrings/ To add the repository, in /etc/apt/sources.list.d, create a file named proxmox.sources and add the following below: Types: deb URIs: http://download.proxmox.com/debian/pbs Suites: [debian version] Components: pbs-no-subscription Signed-By: /usr/share/keyrings/proxmox-release-[debian version].gpg Once you have this saved go ahead and run the following commands: apt update apt-get install proxmox-backup-client When the installation finished you should be able to run proxmox-backup-client and get the following manual: If you have any issues installing the client, please refer to  Proxmox's Official Documentation or reach out to support@untangledtechnology.com