1. copies of computer data stored separately for protection against loss
2. people or things that provide support or serve as substitutes
3. accumulations or blockages caused by obstruction

Examples

• Make sure to create regular backups of your important files.
• The company stores its data backups in a secure off-site location.
• We need backups for the presentation in case the main speaker gets sick.
• The police called for backups when the situation escalated.
• Traffic backups on the highway caused major delays.
• The plumber fixed the backups in the drainage system.