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anamethatisnt , 4 months ago KVM/QEMU/Libvirt/virt-manager on a Debian 12 for minimal installation that allows you to choose backup tools and the like on your own. Proxmox for a mature KVM-based virtualizer with built in tools for backups, clustering, etcetera. Also supports LXC. https://github.com/proxmox Incus for LXC/KVM virtualization - younger solution than Proxmox and more focused on LXC. https://github.com/lxc/incus