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In rust there's also Proxmox Backup Server:

https://pbs.proxmox.com/wiki/index.php/Main_Page

Can be used without proxmox, has a web UI.

Proxmox BS is recent and looks very good. The only problem, at the moment, is that the client is only available for a small set of platforms/OSes. Also no bare metal recovery of a proxmox VE installation (AFAIK).

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