Flickr is an image hosting service which allows you to backup photos & videos, also organize, edit and share them with your family & friends. You can also share Flickr videos to social networking sites like Facebook & Twitter. Flickr allows you to label your uploaded photos with titles & descriptions. Flickr allows you to tag people in your photos, photo title & comments by adding the @ sign. Adding tags to your photos will help you to search them quickly. It will also helpful to the photos to come up in a viewer's search.
You can install PicBackMan's Flickr uploader for Mac from the website and start backing up photos and videos.