Archiving is the preservation of digital material so it can be accessed, studied, or referenced later. In security work, archives can include log files, camera feeds, emails, configuration backups, and malware samples. The key idea is that preserved data is kept intentionally, with enough context and integrity checks to remain trustworthy over time.
Archiving matters because old data often becomes evidence. Defenders use archives to investigate incidents, compare system states, and prove what happened before a compromise or outage. Attackers also care about archives: stolen data is often copied, compressed, and stored for later use, and defenders may recover archived artifacts to detect persistence or reconstruct activity. Good archiving practices include access control, retention rules, encryption, and careful retirement of outdated material. Without them, useful records can become privacy risks or false evidence.