noun / adjective
backup
BAK-up/ˈbækʌp/
A reserve available when the primary resource fails.
The spare wheel provides a backup for the car's flat tire.

Etymology
Back up meant to stand behind and support someone. The noun turns that supporting role into a standby or reserve—a person, copy, or system available when needed.
In context
if oboes crack does everyone have a backup yeah I mean in the professional world most most people have to not just for that reason but it's a good reason to have a second one
More examples
- The hospital switched to its backup generator.
- The officer requested backup before entering the building.
- Regular backups protect the work if a computer fails.
Forms
backup · backups