Website Care, Performance & Security
Incremental vs Differential Backup
Incremental and differential backups both save changes, but they use different reference points to determine which data to capture.
An incremental backup typically captures changes since the most recent backup in the chain, whether that previous backup was full or incremental. A differential backup captures changes since the last full backup. After several days, differential backups may grow while incremental sets remain smaller, although actual sizes depend on changes and the backup system.
Restoring from incremental backups commonly requires the last full backup plus the necessary incremental sequence. A differential restore generally needs the full backup and the selected differential backup. This can affect recovery time, storage, verification complexity and the consequences of a damaged backup set. Specific software may implement snapshots and retention policies differently.
Neither approach guarantees a successful restore. Administrators must verify backup integrity, encryption and access controls, offsite recovery options and a regular test-restore process. The practical choice should reflect the acceptable recovery point and recovery time, not just the backup file size. This is a narrower comparison than the general Website Backup glossary topic.