/**
 * Numbered backup system for CLEO data files.
 * Maintains a rotating window of recent backups for rollback protection.
 * @epic T4454
 * @task T4457
 */
/**
 * Create a numbered backup of a file.
 * Rotates existing backups (file.1 -> file.2, etc.) and removes excess.
 */
export declare function createBackup(filePath: string, backupDir: string, maxBackups?: number): Promise<string>;
/**
 * List existing backups for a file, sorted by number (newest first).
 */
export declare function listBackups(fileName: string, backupDir: string): Promise<string[]>;
/**
 * Restore a file from its most recent backup.
 * Returns the path of the backup that was restored.
 *
 * A target under a project's `.cleo/` is guarded against a run from inside a
 * git worktree (T12680): see {@link assertRestoreTargetConfirmed}.
 *
 * @param fileName - File to restore.
 * @param backupDir - Directory holding its numbered backups.
 * @param targetPath - Where to write it.
 * @param opts - Invocation directory (required: core never falls back to
 *   `process.cwd()`), and confirmation to overwrite the owning project's live
 *   store from a worktree.
 * @returns The backup file restored from.
 */
export declare function restoreFromBackup(fileName: string, backupDir: string, targetPath: string, opts: {
    confirmOwnerStore?: boolean | undefined;
    cwd: string;
}): Promise<string>;
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