Final answer:
The term that describes any type of storage that prevents loss of files due to hard-disk failure is Backup.
Step-by-step explanation:
The term that describes any type of storage that prevents loss of files due to hard-disk failure is Backup. A backup is a copy of important files or data that is stored separately from the original files in case of a failure or loss. It is important to regularly create backups to ensure the safety of files and prevent data loss.