Flickr is photo sharing website which allows you to create a photo Gallery. Flickr has a feature "Galleries' which is used to showcase your photos. Galleries are albums of other people's photos which you can make and share. You can assemble collections of up to 18 photos per gallery. You can not choose photos from your own Photostream to add into gallery. You can create a photo gallery in Flickr with simple steps. To create a photo gallery, search for photos and click 'Add to Gallery' link located within the More menu. This is how you can create a photo gallery in Flickr. To add photos to a gallery, click 'Create a new gallery' or select an existing gallery and click 'Add to Gallery' button. Once you add a photo to your gallery, Flickr will send an email to the people or photographer to notify him. You can share your photo gallery with others by simply clicking on 'Share' button.
You can install PicBackMan's Flickr uploader for Mac from the website and start backing up photos and videos.