Flickr is an online photo management and sharing application run by Yahoo. It allows you to backup photos and videos, and share them to other social networking sites. You can also share Flickr videos with family and friends. You can upload photos up to 200 MB in size and videos of up to 1GB for each video. You can also upload HD video to your Flickr account. But, you can view your HD video on Pro accounts only. Flickr has created 3 new content types specific to video i.e. 'Normal' videos, 'screencasts', and 'animations/CGI'.
You can install PicBackMan's Flickr uploader for Mac from the website and start backing up photos and videos.