Full - all files , incremental - only files that have changed since the last backup, differential - only files that have changed since the last full back up, synthetic - combo back up, full back, incremental or differential back up to make another full back up, GFS grandfather father son - son is daily back ups, often incremental. Father is weekly, full back up. Grandfather is monthly/yearly, full back ups., 321 back up rule - backup rule recommends three data copies, stored across two different media types, with at least one copy offsite. This approach ensures data redundancy and disaster recovery.,

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