Maintaining Your Proxmox Setup
Backups and snapshots
VM Snapshots: Quick rollbacks during upgrades or experiments. With 9.0 you also get improvements for snapshot chains across block storage. (Admin Guide 9.x - Index)
Proxmox Backup Server 4.0: Install PBS on another box or VM to take deduplicated, encrypted backups on schedule. 4.0 adds S3-compatible datastores as a tech preview if you want off-site object storage. (Proxmox Backup Server 4.0), (Proxmox Backup Server Documentation)
Proxmox VE integrates with PBS from the GUI - add the backup storage, make a schedule, and keep at least one off-box copy. (Proxmox Backup Server Documentation)
Common pitfalls and clean fixes
Using the wrong repo: Enable the no-subscription repo only for labs and homelabs. Enterprise repo is for production. (Package Repositories - No-Subscription)
Cloud-init too minimal: PVE’s defaults set users and keys, but richer first-boot configs need NoCloud
user-dataorcicustom. (Cloud-Init Support), (Cloud-Init Documentation)Messy networking: Start with a single bridge and a VLAN aware setting. Save SDN until you actually need multi-node routing. (Network Configuration)
GPU passthrough misses: Confirm IOMMU groups, bind to VFIO, and avoid the host driver grabbing the device. Use the official passthrough doc. If you need to share one card, research vGPU. (PCI(e) Passthrough)
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