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    #!/bin/bash
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    # ==============================
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    #        可配置项
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    # ==============================
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    # 要备份的目录（不要加 /）
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    source_dir="/备份目录"
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    # 本地备份目录
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    backup_dir="/本地备份目录"
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    mkdir -p "$backup_dir"
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    # rclone 远程路径（例如 gdrive:/backup）
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    remote="路径:/文件路径"
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    # 允许通过环境变量设置自定义前缀，默认值为 "backup"
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    filename_prefix="${FILENAME_PREFIX:-backup}"
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    # ==============================
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    #        自动变量
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    # ==============================
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    now=$(date +"%Y-%m-%d_%H-%M-%S")
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    backup_file="$backup_dir/${filename_prefix}_${now}.zip"
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    parent_dir=$(dirname "$source_dir")
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    target_dir=$(basename "$source_dir")
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    echo "======================================"
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    echo "📦 开始备份任务"
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    echo "源目录: $source_dir"
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    echo "备份文件: $backup_file"
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    echo "======================================"
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    # ==============================
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    #         开始压缩（静默）
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    # ==============================
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    cd "$parent_dir" || { echo "❌ 无法进入目录 $parent_dir"; exit 1; }
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    echo "📦 正在压缩..."
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    zip -r "$backup_file" "$target_dir" > /dev/null
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    if [ $? -ne 0 ]; then
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        echo "❌ 压缩失败"
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        exit 1
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    fi
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    echo "✅ 压缩完成"
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    du -h "$backup_file"
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    # ==============================
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    #         上传到远程（显示进度）
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    # ==============================
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    echo "======================================"
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    echo "📤 开始上传到远程：$remote"
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    echo "======================================"
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    rclone copy "$backup_file" "$remote" \
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        --progress \
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        --stats 5s \
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        --stats-one-line \
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        --transfers=1 \
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        --checkers=1
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    if [ $? -ne 0 ]; then
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        echo "❌ 上传失败"
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        exit 1
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    fi
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    echo "✅ 上传完成"
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    # ==============================
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    #      清理本地旧备份
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    # ==============================
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    echo "🗑️ 清理本地旧备份（保留最近 3 个）..."
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    ls -1t "$backup_dir"/${filename_prefix}_*.zip 2>/dev/null | sed -e '1,3d' | while read old_file; do
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        echo "删除本地：$old_file"
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        rm -f "$old_file"
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    done
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    # ==============================
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    #      清理远程旧备份
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    # ==============================
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    echo "🗑️ 清理远程旧备份（保留最近 3 个）..."
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    rclone lsf "$remote" --files-only | \
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    grep "^${filename_prefix}_" | \
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    sort -r | \
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    awk 'NR>3' | \
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    while read file; do
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        echo "删除远程：$file"
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        rclone deletefile "$remote/$file"
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    done
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    echo "======================================"
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    echo "🎉 所有操作完成"
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    echo "======================================"