Debian Based Installation

Debian Trixie

Copy the key to /usr/share/keyrings/

wget https://enterprise.proxmox.com/debian/proxmox-archive-keyring.gpg

Then create/edit the file /etc/apt/sources.list.d/pbs-client.sources 

Types: deb
URIs: http://download.proxmox.com/debian/pbs-client
Suites: trixie
Components: main
Signed-By: /usr/share/keyrings/proxmox-archive-keyring.gpg

Run

apt update

apt install proxmox-backup-client

 

Please reference Proxmox's Official Documentation for further details