ISC Backups · Updated November 2026

Full, Incremental, or Differential: Which Backup Needs What to Restore?

Incremental resets from every backup. Differential resets only from the last full backup.

Full

Copies the selected data set and is simpler to restore, but uses more time and storage.

Incremental

Copies changes since the most recent backup, whether full or incremental. Restoration can require the last full backup plus each incremental in sequence.

Differential

Copies changes since the last full backup. Restoration typically needs the last full backup plus the most recent differential.

Tradeoffs

Backup design balances backup windows, storage, restore speed, and recovery objectives.

The takeaway

Incremental follows the last backup. Differential follows the last full backup.

Related Summit guides

RTO vs RPOContinue with a related Summit CPA Review guide.Data lifecycleContinue with a related Summit CPA Review guide.Incident responseContinue with a related Summit CPA Review guide.

FAQ

Which backup is simplest to restore?

A full backup is typically simplest.

Which can use less daily backup time?

Incremental backups can.

Does backup strategy affect RPO?

Yes.