import { IStorageAdapter } from '../../storage/storage.interface';
export interface RetentionConfig {
    enabled: boolean;
    maxBackups?: number;
    maxAgeDays?: number;
    minBackups?: number;
    runAfterBackup?: boolean;
}
export interface RetentionStats {
    totalBackups: number;
    keptBackups: number;
    deletedBackups: number;
    spaceReclaimed: number;
    errors: string[];
}
export interface BackupInfo {
    key: string;
    size: number;
    lastModified: Date;
    shouldDelete: boolean;
    reason?: string;
}
export declare function evaluateRetention(adapter: IStorageAdapter, config: RetentionConfig, storageProvider: string): Promise<BackupInfo[]>;
export declare function applyRetention(adapter: IStorageAdapter, config: RetentionConfig, storageProvider: string, dryRun?: boolean): Promise<RetentionStats>;
export declare function getDefaultRetentionConfig(): RetentionConfig;
export declare function formatRetentionStats(stats: RetentionStats): string;