Proxmox Backup Server is rock solid in the 2 years I've used it. It does a great job of dedup keeping hundreds of backup points as space efficient as you could

Proxmox Backup Server is rock solid in the 2 years I've used it. It does a great job of dedup keeping hundreds of backup points as space efficient as you could hope for. And file restores or full VM restores are painless. I've even used the Linux client to virtualize physical boxes.