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Source: https://pbs.proxmox.com/wiki/index.php/Upgrade_from_1.1_to_2.x
Voici les quelques commandes utilisées pour mettre à jour Proxmox Backup Server de la version 1.1 à la version 2.X
apt-get update
apt-get upgrade
apt-get dist-upgrade
proxmox-backup-manager versions
sed -i 's/buster\/updates/bullseye-security/g;s/buster/bullseye/g' /etc/apt/sources.list
systemctl stop proxmox-backup-proxy.service proxmox-backup.service
apt-get update
apt-get dist-upgrade
reboot now
apt-get update
apt-get upgrade
apt autoremove