Recovering 200 photos: If you delete 100 photos from the added photos and edit 100 photos from the original photos, the differential backup will back up the edited 100 photos and the 100 added photos (left after deletion). The differential backup will back up the edited 100 photos. Recovering 100 photos: Both deletion and editing happen to the added 200 photos. You get image files of 100 photos, 200 photos and 300 photos. Thursday: You delete 100 photos and edit another 100 photos (total of 300 photos) and perform a differential backup.You get an image file of the newly added 200 photos on Tuesday. Wednesday: You make no changes and perform a differential backup on the existing 400 photos.You get an image file of the newly added 200 photos. Tuesday: You add another 200 photos (a total of 400 photos) and perform a differential backup.Monday: You have 200 photos and perform a full backup.
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