Proxmox Backup Server

Proxmox Backup Server is purpose-built to back up and restore virtual machines, containers, and physical hosts with maximum efficiency and minimum fuss. The entire software stack is written in Rust — a language chosen specifically for its speed, memory safety, and thread-safety — which translates directly into backup and restore performance that'll make your existing solution feel sluggish.

The architecture is built around incremental backups with server-side deduplication. Only changed data blocks are transferred across the network, and the server deduplicates everything automatically, dramatically reducing both network traffic and physical storage consumption. Compression uses Zstandard (ZSTD), which handles several gigabytes per second without breaking a sweat. The net effect is smaller backup windows, less storage spend, and faster restores — which is exactly what matters when you're staring down a ransomware incident at 3am.

Security is baked into the foundation, not bolted on as an afterthought. Client-side AES-256-GCM encryption ensures your backup data is encrypted before it ever leaves the source host. SHA-256 checksums verify integrity and detect bit rot automatically. For ransomware protection, Proxmox Backup Server supports immutable WORM tape integration, secure off-site syncing between datastore instances, and fine-grained access control that limits what even compromised administrator accounts can do. Granular recovery lets you restore individual files, directories, or entire VM archives directly from the web UI — no need to restore an entire backup just to retrieve one file.

Integration with Proxmox VE is native. Add the Backup Server as a storage target in Proxmox VE, and it works exactly like any other storage type. Schedule backups, monitor jobs, and restore VMs — all from the same interface you already use to manage your virtualisation environment.