PBS Backups & Replication
Proxmox Backup Server instances, IPs, VLAN 90 allocation, and the cross-site replication strategy for disaster recovery.
Proxmox Backup Server (PBS) runs at both sites, providing local VM backups and cross-site replication for disaster recovery. PBS-A serves Site A and PBS-B serves Site B; neither site is the sole backup target.
No stretched Ceph — use PBS replication for cross-site DR
Site B Ceph stays local to Site B. Do not stretch Ceph across sites. Cross-site disaster recovery uses PBS replication, not stretched Ceph.
PBS Instances
Each PBS instance has two network interfaces: a management interface on VLAN 30 (VM Services) and a backup-data interface on VLAN 90 (Backup / Replication).
| Instance | Site | Mgmt IP (VLAN 30) | Backup-data IP (VLAN 90) |
|---|---|---|---|
| PBS-A | Site A | 10.10.30.20 | 10.10.90.40 |
| PBS-B | Site B | 10.20.30.20 | 10.20.90.40 |
PBS-A runs on sa-stor-01 (the Supermicro 5049A-T), co-located with ZFS storage, the Site A DNS VMs (sa-dns-01 / sa-dns-02), monitoring, and core infrastructure VMs. PBS-B runs as a service VM within the sb-pve cluster; the specific Proxmox node that hosts the PBS-B VM is not pinned in the current design.
VLAN 90 — Backup / Replication
Backup and replication traffic flows on VLAN 90, separate from management (VLAN 20), Corosync (VLAN 25), and general VM services (VLAN 30).
| VLAN | Name | Site A | Site B |
|---|---|---|---|
| 90 | Backup / Replication | 10.10.90.0/24 | 10.20.90.0/24 |
The .40 address within each /24 is reserved for the PBS backup-data interface (10.10.90.40 for PBS-A, 10.20.90.40 for PBS-B). This follows the address-block convention: .40–.49 is the band for infrastructure service VMs.
Backup Strategy
Both PBS instances run local backups at their own site. PBS data is replicated cross-site for disaster recovery so that a full site failure does not result in complete data loss.
- Run local backups at each site independently.
- Replicate PBS data cross-site for disaster recovery.
- Do not rely on one site for all backups.
Local-first backup
Each PBS instance operates locally within its site. Local backup jobs continue regardless of the inter-site WireGuard tunnel state.
The cross-site PBS replication path uses the WireGuard tunnel (10.255.0.0/24) that connects sa-fw-01 and sb-fw-01. See WireGuard for tunnel configuration.
Related Pages
- Proxmox Clusters — cluster setup and node membership
- Site A ZFS — ZFS mirror vdevs on
sa-stor-01 - Site B Ceph — local Ceph cluster within
sb-pve - VLAN Reference — full VLAN table including VLAN 90
- WireGuard — inter-site tunnel used for cross-site replication
Site B Ceph Storage
Site B Ceph plan: five-node cluster across FN8TP and FN4T hardware, replication size 3, public (VLAN 60) and cluster (VLAN 65) network split, Micron drive recommendations, and Proxmox pveceph deployment.
Kubernetes / OpenShift
Overview of Kubernetes and OpenShift plans for the two-site homelab: node networks on VLAN 40, VIP pools on VLAN 50, planned stack, and machine-network allocations for multiple clusters.