How to delete pictures from my auto back up on the Samsung Galaxy Tab 4?

I have no space left what so ever on my tablet and i really need to update the apps and the software. I have 796 photos and most of them i need to delete. I really need this help badly. Anyways, thanks for your help.

Back up your photos first. After backing up photos, go to Settings > Application manager > All > Gallery > tap Clear data. Let me know if that works.

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