Flickr is an online photo and video hosting website which allows you to backup photos and videos to share with family and friends. Once you have backed up a photo to Flickr, you can add a person to a photo. To add a person to a photo, open the photo in full size, you will see 'People in this photo' section below the photo on the right side of a photo page. Click 'Add a person' link located under 'People in this photo' section. Type the name or email address of a person in the photo. You can also add a person to a photo by double-clicking or click-and-dragging directly on a photo. Flickr allows you to add a face boundary around a person which is helpful to sort the individual person. Click on the icon next to their name and then position the face boundary which appears on the photo. It is helpful to identify the person in the photo.
You can install PicBackMan's Flickr uploader for Mac from the website and start backing up photos and videos.