Backup
A backup is a separate copy of data kept so it can be restored after loss, damage, or an unwanted change.
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Definition
A backup is a separate copy of data kept so it can be restored after loss, damage, or an unwanted change.
How it works
A backup only counts if it can actually bring your site back: the files, the database, and the configuration that ties them together. Keep copies somewhere that will not fail alongside the live server, decide how long to retain them, and test a restore before you need one. An untested backup is a hope, not a plan.
Example: A website backup might include uploaded files, the application code, and a matching database export.
Often confused: A backup gets you back after something breaks; high availability tries to keep things running while it breaks. You will often want both.
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Last reviewed 2026-07-19.