In cases of backing up a folder that one wasn't planning to backup and contains a lot of photos that are not needed to be kept or even archived, an option to group select and delete them could be really useful and save storage as well. It's a big hassle to go through them one by one to perform the "keep or archive" process, when I know for a fact I want to delete(not even archive) say the next 2000 photos. If there is a way to perform multi-select and delete(archive or keep could also be options after selecting) photos that are to be reviewed, it will really help clean up past mistakes in backing up photos.