A backup is a copy of digital files or data stored separately from the original, providing protection against data loss from hardware failure, cyberattacks, accidental deletion, or disasters. Individuals back up important documents and photos to external drives or cloud storage. Organizations implement comprehensive backup strategies, regularly copying critical data and testing restoration procedures. Government bodies are required to maintain robust backup systems to protect citizen records and ensure continuity of services. The '3-2-1 rule' recommends keeping three copies of data on two different types of media, with one copy stored offsite.