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The backup software looks at which files have changed since you last did a full backup. Then creates copies of all the files that are different from the ones in the full backup.The backup software looks at which files have changed since you last did a full backup. Then creates copies of all the files that are different from the ones in the full backup. Rather than backing up only the changes from the previous backup, each differential backup includes all the changes from the baseline full backup. So day 2’s backup would include changes from day 1 to day 2. Day 3’s backup would include changes from day 1 to day 3.