<!DOCTYPE html>
        <html>
        <head>
            <title>文件备份系统</title>
            <meta charset="UTF-8">
            <style>
                body { font-family: Arial, sans-serif; max-width: 600px; margin: 40px auto; padding: 20px; }
                .form-group { margin-bottom: 15px; }
                label { display: block; margin-bottom: 5px; font-weight: bold; }
                input[type="text"], input[type="password"] {
                    width: 100%;
                    padding: 8px;
                    border: 1px solid #ddd;
                    border-radius: 4px;
                    box-sizing: border-box;
                }
                .help { font-size: 12px; color: #666; margin-top: 3px; }
                .btn {
                    background: #4CAF50;
                    color: white;
                    padding: 10px 20px;
                    border: none;
                    border-radius: 4px;
                    cursor: pointer;
                    font-size: 16px;
                }
                .btn:hover { background: #45a049; }
                .warning { background: #fff3cd; border: 1px solid #ffeaa7; padding: 10px; border-radius: 4px; margin: 20px 0; }
            </style>
        </head>
        <body>
            <h1>文件备份系统</h1>
            
            <div class="warning">
                <strong>注意:</strong>
                <p>1. 大文件会自动分块上传(断点续传)</p>
                <p>2. 只备份修改过或新文件(通过MD5校验)</p>
                <p>3. 备份过程请勿关闭页面</p>
            </div>
            
            <form method="POST">
                <div class="form-group">
                    <label for="directory">要备份的目录:</label>
                    <input type="text" id="directory" name="directory" value="/mnt/sda1/www/2026" required>
                    <div class="help">绝对路径或相对路径</div>
                </div>
                
                <div class="form-group">
                    <label for="receiver_url">接收端API地址:</label>
                    <input type="text" id="receiver_url" name="receiver_url" value="http://your-domain.com/backup_system.php?action=receive" required>
                </div>
                
                <div class="form-group">
                    <label for="api_key">API密钥:</label>
                    <input type="password" id="api_key" name="api_key" value="your-secret-api-key-123456" required>
                </div>
                
                <button type="submit" class="btn">开始备份</button>
            </form>
            
            <div style="margin-top: 30px; font-size: 14px; color: #666;">
                <h3>备份历史:</h3></div></body></html>