About Proxmox
Proxmox is an open-source server solution suite for enterprise IT environments that combines virtualization, data protection, and mail security in a single platform. It serves data centers from small businesses to large-scale operations, providing centralized management for VMs, containers, backups, and mail security.

Key Features
In practice, admins manage virtualization, backups, and mail security from one interface, enabling a cohesive workflow across workloads:
Virtualization Management
Manage VMs and containers via a built-in web UI, with software-defined storage and networking and high-availability clustering.
Backup & Recovery
Back up and restore VMs, containers, and hosts with incremental backups, deduplication, Zstandard compression, and authenticated encryption.
Mail Security Gateway
Open-source mail proxy that defends against threats and can be placed between the firewall and internal mail servers.
Unified Management & Orchestration
A single interface coordinates virtualization, backups, and security settings across the stack.
Summary
Best for enterprise data-center IT teams, MSPs managing virtualization and security, and ops teams seeking a single pane for virtualization, backups, and mail security.