export type VaultBackupResult = {
    backupRoot: string | null;
    moved: {
        folder: string;
        entries: number;
    }[];
};
/**
 * Move Nexus-generated vault folders into a recoverable backup before a rebuild.
 *
 * Only exact generated-folder names under the explicitly selected vault are
 * touched. Older/guessed vault locations are never scanned.
 */
export declare function backupGeneratedVaultFolders(vaultPath: string): VaultBackupResult;