Backup and Restore, the backup component of Windows, is deprecated. These are commands to backup and restore files from an external disk. It supports both full system backup and individual files or folders backup. Some encrypted backup and file sharing services provide client-side encryption. Snapshots allow reliable backup of a live filesystem. The backup and restore functionality has also been improved. Additional techniques apply to enterprise client-server backup. See Comparison of backup software for features. A differential backup saves only the data that has changed since the last full backup. It has all features of Norton Utilities plus Norton Online Backup. Several methods are available for installing Backup Exec. It then retrieves them when doing an incremental backup. Ansys also develops software for data management and backup, academic research and teaching. The system has a hand crank provided as a backup. The deduplication process is transparent to the users and backup applications.