%% Velero Backup Architecture
%% Related: ADR-0032

flowchart TB
    subgraph Schedule["Backup Schedule"]
        Nightly["Nightly Backup<br/>2:00 AM"]
        Hourly["Hourly Snapshots<br/>Critical Namespaces"]
    end

    subgraph Velero["Velero (velero namespace)"]
        Server["Velero Server"]
        NodeAgent["Node Agent<br/>(DaemonSet)"]
    end

    subgraph Sources["Backup Sources"]
        PVs["Persistent Volumes<br/>(Longhorn)"]
        Resources["Kubernetes Resources<br/>(Secrets, ConfigMaps)"]
        DBs["Database Dumps<br/>(Pre-backup hooks)"]
    end

    subgraph Targets["Backup Destinations"]
        subgraph Primary["Primary: S3"]
            MinIO["MinIO<br/>On-premises S3"]
        end
        subgraph Secondary["Secondary: NFS"]
            NAS["QNAP NAS<br/>Long-term retention"]
        end
    end

    subgraph Restore["Restore Options"]
        Full["Full Cluster Restore"]
        Namespace["Namespace Restore"]
        Selective["Selective Resource Restore"]
    end

    Nightly --> Server
    Hourly --> Server
    Server --> NodeAgent
    NodeAgent --> PVs
    Server --> Resources
    Server --> DBs
    
    Server --> MinIO
    MinIO -.->|Replicated| NAS

    Server --> Full
    Server --> Namespace
    Server --> Selective

    classDef schedule fill:#4a5568,stroke:#718096,color:#fff
    classDef velero fill:#667eea,stroke:#5a67d8,color:#fff
    classDef source fill:#48bb78,stroke:#38a169,color:#fff
    classDef target fill:#ed8936,stroke:#dd6b20,color:#fff
    classDef restore fill:#9f7aea,stroke:#805ad5,color:#fff

    class Nightly,Hourly schedule
    class Server,NodeAgent velero
    class PVs,Resources,DBs source
    class MinIO,NAS target
    class Full,Namespace,Selective restore