A backup copy is a duplicate or second version of something important that is stored separately. It is made to ensure that if the original gets lost, damaged, or deleted, the backup copy can be used to restore or replace it. Full definition
One reason is for making backup copies of their work. (easyedit.co)
It creates backup copies of important system and program files on a schedule or when you perform certain tasks, such as installing a hardware driver. (howtogeek.com)
The Privacy Policy says that you can opt out of the service, but they may keep offline backup copies in their archive. (slaw.ca)