How-to guide

Install & set up Proxmox Backup Server, step by step.

Install, harden, and tune PBS for reliable backups from Proxmox VE. This walkthrough covers storage, networking, TLS, retention, and restore testing.

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At a glance

Get a production-ready PBS fast.

  • 01Install PBS on Debian/ISO
  • 02Design storage + network layout
  • 03Harden access with TLS and roles
  • 04Connect PVE and schedule jobs

Contents

Prep checklist

  • 64-bit CPU with AES-NI, 16 GB+ RAM minimum; more for heavy backup workloads.
  • Dedicated datastore disks (SAS/NVMe). Keep OS separate.
  • 10/25 Gbps NICs on a backup VLAN; consistent MTU end-to-end.
  • Forward and reverse DNS for the PBS hostname, plus a valid TLS cert plan (ACME or imported).
  • NTP enabled on PBS and all Proxmox VE nodes.

1) Install Proxmox Backup Server

Use the ISO when possible. For current PBS 4 on Debian 13 (trixie), add the pbs-no-subscription repository with deb822:

sudo install -d /etc/apt/keyrings
wget -qO /etc/apt/keyrings/proxmox-release-bookworm.gpg https://enterprise.proxmox.com/debian/proxmox-release-bookworm.gpg
cat <<'EOF' | sudo tee /etc/apt/sources.list.d/pbs.sources
Types: deb
URIs: http://download.proxmox.com/debian/pbs
Suites: trixie
Components: pbs-no-subscription
Signed-By: /etc/apt/keyrings/proxmox-release-bookworm.gpg
EOF
sudo apt update && sudo apt install proxmox-backup-server

For PBS 3.x on Debian 12 (bookworm), you can still use the legacy list entry:

echo "deb http://download.proxmox.com/debian/pbs bookworm pbs-no-subscription" \
  | sudo tee /etc/apt/sources.list.d/pbs.list
wget -qO- https://enterprise.proxmox.com/debian/proxmox-release-bookworm.gpg \
  | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/proxmox-release.gpg
sudo apt update && sudo apt install proxmox-backup-server

Access the UI at https://<pbs-host>:8007. Create an admin user in the pbs realm to avoid daily root usage.

2) Design storage and datastores

Separate OS and datastore disks. ZFS mirror/RAID10 on SAS/NVMe gives predictable backup and restore speeds.

  • Create pool (example): zpool create -f pbsdata mirror /dev/sdX /dev/sdY.
  • Mount at /mnt/pbsdata and persist with /etc/fstab or a systemd mount.
  • In PBS: Administration > Storage > Add > Directory → path /mnt/pbsdata → name primary.
  • Enable Namespace Mode if you need tenant/environment separation.
  • Add a metadata/special device for faster metadata-heavy operations on large repos.

3) Network for backup traffic

  • Use a dedicated VLAN/VRF for backups; keep management separate.
  • Match MTU across path; check with ping -M do -s 8972 <pbs> for jumbo frames.
  • Prefer bonded uplinks (LACP) and pin PBS NICs to backup networks.
  • Monitor drops/retransmits during peak periods; adjust offload settings if CPU-bound.

4) Secure PBS (TLS, auth, firewall)

  • TLS: Use ACME or upload a signed cert for the hostname PVE will use.
  • Accounts: Create pbs-backup in pbs realm; assign BackupAdmin or scoped DatastorePowerUser.
  • Tokens: Issue API tokens per PVE cluster; scope to datastores.
  • Firewall: Allow TCP 8007 from PVE nodes; restrict SSH/UI to admin sources.
  • 2FA: Require for UI logins where possible.

5) Connect Proxmox VE to PBS

Add PBS storage in each PVE cluster.

# In PVE: Datacenter > Storage > Add > Proxmox Backup Server
# CLI option:
pvesm add pbs pbs-primary \
  --server pbs.example.com \
  --fingerprint <pbs-fingerprint> \
  --datastore primary \
  --username pbs@pbs --password 'TOKEN_OR_PASSWORD'
  • Get the fingerprint on PBS: proxmox-backup-manager cert info | grep SHA256.
  • For tokens: --username 'pbs@pbs!tokenid' and --password 'token-secret'.
  • Enable “Validate TLS certificate” in PVE to enforce hostname match.

6) Build backup jobs

  • Schedule VM backups daily or twice daily; align with your environment.
  • Retention starting point: keep 7 daily, 4 weekly, 3 monthly; avoid unlimited.
  • Compression: keep zstd unless CPU constrained.
  • Bandwidth: apply per-job limits only during business hours if needed.
  • Use namespaces or tags to separate prod/stage and simplify organization.

7) Hardening, monitoring, and updates

  • Disable unused accounts; enforce 2FA; rotate tokens.
  • Ship logs to a collector; monitor task-log, system health, and SMART/ZFS status.
  • Update regularly: apt update && apt upgrade; reboot in planned maintenance periods.
  • Consider a secondary PBS for Remote Sync (offsite/DR).

8) Test restores

  • Restore to a non-production VMID or fenced network monthly.
  • File-level: mount snapshots from PBS or via proxmox-backup-client mount.
  • Record RTO/RPO; tune bandwidth or retention to meet targets.

Troubleshooting quick hits

  • Slow backups: Check source disk/NIC throughput; MTU match; watch CPU/ARC on PBS.
  • Cert warnings: Use the FQDN in the cert; refresh fingerprint in PVE after renewals.
  • Space pressure: Add capacity or adjust retention to stabilize growth.

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