backup
backup Lexical Profile
backup Game Scores & Validity
• noun
A copy of computer data or files stored separately so that it may be used to restore the original after a data loss event.
"The IT department performs an automated backup of the company servers every night."
A person, plan, or piece of equipment kept in reserve to act as a substitute or provide additional support if needed.
"The expedition team brought an extra satellite phone as a backup in case the primary unit malfunctioned."
North American An accumulation or congestion of traffic, water, or work caused by an obstruction or delay.
"Road construction on the bridge caused a three-mile traffic backup during the morning commute."
Musical accompaniment provided by background singers or instrumentalists in support of a lead performer.
"She started her career singing backup for famous soul artists before releasing her own solo album."
• adjective
Serving as a substitute, reserve, or auxiliary resource in case the primary person or thing fails or becomes unavailable.
"The hospital relies on a backup generator to maintain electrical power during severe storms."
Word Nuance & Usage
The closed compound "backup" is used as a noun or adjective (e.g., "a data backup," "a backup plan"), whereas the open two-word form "back up" functions as a phrasal verb (e.g., "please back up your files").