NTBackup is the built-in backup application introduced in Windows NT around 1997 and part of all subsequent versions up to and including Windows 2000, Windows XP and Windows Server 2003. It uses a proprietary backup format (BKF) to back up files. Files can be backed up to tape, ZIP drives, floppy disks, and hard drives. It also features integration with Task Scheduler and has several command line switches for scheduled automated backups.