Incremental backups only capture the data that changed since the last backup (whether full or incremental), so they are the fastest to create but the slowest to restore. To fully restore data, the last full backup must be restored first, followed by every incremental backup made since that full backup, applied in the correct sequence. This multi-step process takes significantly longer than restoring a differential backup (which only requires the last full backup plus the single most recent differential) or a full backup (which requires only one restore operation). Disk mirroring offers near-instantaneous recovery since a live duplicate copy already exists.
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