Flickr is a photo and video sharing website which allows you to capture a photo or video to share with others. If the first time someone adds one of your photos and videos to a gallery, then Flickr will send you an email notification to let you know about gallery and introducing you to gallery. You can see how other Flickr members are including your photos and videos in their galleries. To see this, go to your Flickr account and select the 'Galleries' option from the menu. Click 'Galleries With Your Photos' link from your Galleries page.
You can install PicBackMan's Flickr uploader for Mac from the website and start backing up photos and videos.