Installing Proxmox Backup Server on Debian

From OISecWiki

Installing Proxmox Backup Server on Debian

Proxmox Backup Server (PBS) is an open-source, enterprise-class client-server backup solution optimized for backing up Proxmox VE virtual machines, containers, and physical hosts. It features deduplication, incremental backups, encryption, and high performance.[1]

The recommended installation method is using the official ISO installer on bare metal, which provides a complete Debian-based system with all necessary packages.[2]

Installing PBS packages on an existing Debian system is supported but not recommended for production, as it requires correct base system configuration, storage setup (e.g., LVM or ZFS), and network management, which can be complex.[2]

As of December 2025, the latest version is Proxmox Backup Server 4.1 (released November 26, 2025), based on Debian 13.2 "Trixie".[3]

Prerequisites

  • A 64-bit Debian 13 "Trixie" installation (fresh recommended for compatibility).
  • Root access.
  • Internet connection.
  • Hardware: 64-bit CPU with virtualization support, at least 8 GB RAM, fast storage (SSD/NVMe recommended for datastores).
  • Dedicated storage for backup datastores (separate from system disk to avoid performance issues and data loss risks).[2]

Warning: This method assumes proper Debian base setup. Incorrect configuration can lead to issues or data loss. For production, use the ISO installer.

Installation Steps

1. Update the system: 

   apt update && apt full-upgrade -y

2. Add the Proxmox release key:

  • Download and install the key (verify checksums for security):
   wget https://enterprise.proxmox.com/debian/proxmox-archive-keyring-trixie.gpg -O /usr/share/keyrings/proxmox-archive-keyring.gpg
  • Optional verification:
   sha256sum /usr/share/keyrings/proxmox-archive-keyring.gpg
   # Expected: 136673be77aba35dcce385b28737689ad64fd785a797e57897589aed08db6e45

3. Add the Proxmox Backup Server repository:

For testing/non-production (no-subscription repository):

Create `/etc/apt/sources.list.d/proxmox.sources` with: 

Types: deb
URIs: http://download.proxmox.com/debian/pbs
Suites: trixie
Components: pbs-no-subscription
Signed-By: /usr/share/keyrings/proxmox-archive-keyring.gpg

For production (enterprise repository, requires subscription):

Use `pbs-enterprise` component and https URI.[2]

4. Update package lists: 

   apt update

5. Install Proxmox Backup Server:

  • Minimal installation (keeps existing Debian kernel):
     apt install proxmox-backup-server -y
  • Full installation (includes Proxmox kernel with ZFS support and additional tools):
     apt install proxmox-backup -y

Postfix may prompt for mail configuration during installation (e.g., select "No configuration" if not needed).

6. Reboot: 

   reboot

Post-Installation

  • Access the web interface: https://your-server-ip:8007 (accept self-signed certificate).
  • Login: root with system root password.
  • Create datastores via GUI (Dashboard > Datastore > Create Datastore).
  • For directory-based datastore: Use a mounted directory on dedicated storage.

Example ZFS setup (if full package installed): 

zpool create -o ashift=12 backup-pool /dev/sdX
zfs create backup-pool/datastore

Then add as ZFS datastore in GUI.[2]

Verification

proxmox-backup-manager versions --verbose

Should show version 4.1 or similar.

References

  1. ↑ Proxmox Backup Server Overview. Proxmox. https://www.proxmox.com/en/products/proxmox-backup-server
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Installation — Proxmox Backup 4.1 documentation. Proxmox. https://pbs.proxmox.com/docs/installation.html. Accessed December 28, 2025.
  3. ↑ Proxmox Backup Server 4.1 released. Proxmox. https://www.proxmox.com/en/about/company-details/press-releases/proxmox-backup-server-4-1. Accessed December 28, 2025.

External links:

Retrieved from "https://wiki.oisec.net/mediawiki/index.php?title=Installing_Proxmox_Backup_Server_on_Debian&oldid=608"