Photector is a free tweak in Cydia that will make it almost impossible for you to accidentally delete your photos. We've all done it, that trash can button is easy to press and has no "are your sure?" prompt. It just goes ahead and deletes your photo without warning. Well Photector give you two options to prevent this. You can change your settings require a password every time you hit that delete button. The second option is have the delete button not work at all, of course you can disable this in the setting when you do need to delete a photo. Either way Photector is great and free in Cydia so check it out.