Backup is the activity of copying files or databases so that they will be preserved in case of equipment failure or other catastrophe. This tag covers restoring from backup as well.
The process of backing up is making copies of data which may be used to restore the original after a data loss event.
The primary purpose is to recover data after its loss, be it by data deletion or corruption.
The secondary purpose of backups is to recover data from an earlier time, according to a user-defined data retention policy, typically configured within a backup application for how long copies of data are required.