You need to do a backup e.g. using Proxmox Backup Server for your (VMs, CTs, /etc/pve/*, configs) then restore them after you re-installed the new Proxmox VE again.
You need to do a backup e.g. using Proxmox Backup Server for your (VMs, CTs, /etc/pve/*, configs) then restore them after you re-installed the new Proxmox VE again.