Xen Orchestra is a comprehensive management platform for XenServer/XCP-ng virtualization environments. It provides a web UI (legacy React and modern Vue 3), a REST API, CLI tools, and a backup system. The architecture is a monorepo with multiple packages: server-side plugins (authentication, performance alerts, SDN controller, backups), frontend apps (xo-web React, @xen-orchestra/web Vue 3, @xen-orchestra/lite lightweight), and shared libraries (filesystem abstractions, VHD manipulation, cron parsing, audit logging, etc.). The backend communicates with XenServer hosts via the Xen API (XAPI), while the frontend connects via WebSocket/JSON-RPC or REST. Backup operations can be executed remotely via a proxy. Key data flows involve the web UI sending commands through WebSocket to the server, which translates them into XAPI calls. Backup jobs are scheduled via cron and executed by the backup runner system, streaming VM disks to remote storage. Audit events are logged with cryptographic chaining for tamper evidence. The system includes an MCP server for AI-assisted management. The repo demonstrates high engineering quality in many packages with clean abstractions for async operations, event-driven collections, and modular plugin systems, though it contains legacy components and some incomplete transitions to newer architectures.