/**
 * Formats a Date as a filesystem-safe timestamp string.
 * Example: "2026-03-15_12-30-45-123"
 */
export declare function formatTimestamp(date: Date): string;
/**
 * Returns the backup directory path for a given server.
 * Includes path traversal guard against crafted server names.
 */
export declare function getBackupDir(serverName: string): string;
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