Learn Proxmox Backup Server - Pre-Requisites Skill & Setup Environment

#Introduction

Welcome to the Learn Proxmox Backup Server series! This series will take you to mastery of Proxmox Backup Server (PBS) — the open source enterprise backup solution that backs up VMs, containers (CTs), and physical hosts with per-chunk deduplication, compression, and client-side encryption. There are 23 episodes in total, organized in six phases, from conceptual foundations to production readiness.

Before you touch proxmox-backup-manager datastore create ..., there are foundational skills and equipment you must have. Why are these prerequisites important? Because PBS is not just a "backup tool": it is a server service that manages storage, networking, security, and tight integration with Proxmox VE. Without understanding these layers, you will struggle when a backup fails in the middle of the night because the disk is full or the network is not isolated.

This Episode 0 is your roadmap: we make sure the foundational skills are in place, prepare the software and hardware components, then verify the environment for the first time. Once this episode is done, the rest of the series can be followed comfortably.

#Foundational Skills You Must Have

#Linux Administration

PBS is a Debian Linux server. You must be comfortable with system installation, network interface management, and storage configuration. Know at least: ip for networking, systemctl for services, journalctl for logs, and lsblk/zfs for viewing disks and pools. Misconfiguring the network at this level is the most common reason PBS becomes unreachable.

#Storage Concepts: ZFS, LVM, and NFS

PBS datastores live on top of storage. You must understand the difference between ZFS (checksums, snapshots, compression), LVM (logical volumes on top of disks), and NFS (network storage). In episode 15 we break down the tuning details, but for now it is enough to understand that the storage choice determines backup durability and performance.

#Backup Concepts: Snapshot, Dedup, and Retention

Understand the basic backup terminology: snapshot (the state of data at one point in time), incremental (only the delta since the last backup), deduplication (avoiding storage of the same data repeatedly), and retention (how long snapshots are kept). PBS builds all of this on top of the chunk concept — details in episodes 2 and 6.

#Proxmox VE Basics

PBS was born to serve the Proxmox VE ecosystem. You must understand the concepts of VMs (qcow2/raw disks) and LXC containers, as well as the Datacenter → Storage interface in PVE. PBS integration with PVE (episode 4) depends entirely on this understanding.

#Software & Hardware to Prepare

#Proxmox Backup Server 4.2

PBS 4.2 (released April 29, 2026, based on Debian 13.4 Trixie) is the current version. You can install it via the ISO installer or the apt repository on top of an existing Debian. For this series, prepare at least one PBS host:

proxmox-backup-manager versions
proxmox-backup-server --version

proxmox-backup-manager versions displays the versions of all components (kernel, ZFS, proxmox-backup), while proxmox-backup-server --version prints the server application version.

#Storage for the Datastore

Prepare local storage (ZFS or LVM) of at least 100 GB for practice, or NFS if you want to experience network storage. ZFS is Proxmox's primary choice because it supports checksums and snapshots — we use it as the default throughout this series.

#Proxmox VE 8.x/9.x as Client

Prepare at least one Proxmox VE 8.x or 9.x node as the client that will back up its VMs/CTs to PBS. Make sure the PVE node can reach PBS over the network (not through a changing NAT).

#Separate or 10G Network

Backup moves a lot of data. PBS and PVE should ideally be connected to a separate storage network (dedicated VLAN), and for medium-to-large environments, a 10G connection is highly recommended. A separate network also makes firewall rules easier — we cover this in full in episode 13.

#Environment Verification

Before continuing, run a thorough verification on all hosts:

uname -r
free -h
df -h /var/lib/proxmox-backup
ip -brief addr

pveversion
pvesm status

pvesm status on PVE displays the detected storage. Make sure there is storage for VMs, and make sure PBS can be ping-ed from PVE.

#Prerequisites Summary

A recap of what you prepared in episode 0:

• Skills: Linux administration, ZFS/LVM/NFS storage, backup concepts, and Proxmox VE basics.
• PBS 4.2: installed and verified with proxmox-backup-manager versions.
• Storage: a ZFS/LVM/NFS datastore with enough space.
• Client: a Proxmox VE 8.x/9.x node that can reach PBS.
• Network: a separate storage VLAN, ideally 10G.

If anything is still missing, stop here and complete it before moving on. The next 22 episodes will go far more smoothly with this strong foundation.

#Closing

Key takeaways:

• PBS is a Debian server that requires an understanding of Linux, storage, and backup.
• Proxmox VE 8.x/9.x is the primary client; PBS 4.2 is our target version.
• ZFS is the storage of choice; NFS is for experiencing network storage.
• A separate/10G storage network is recommended for production.
• Verify the environment with proxmox-backup-manager versions, pvesm status, and connectivity checks.

In the next episode, episode 1, we will discuss the history, background, and why you need PBS — from the Proxmox project in 2018, the 1.0 release in 2020, to the real problems it solves: backup storage costs ballooning because of duplicate data, and security concerns around backup data. Make sure your environment is ready, because the Learn Proxmox Backup Server journey has only just begun!