Dropbox is an online photo & video backup service provided by Dropbox Inc. Backing up photos and videos on Dropbox allows you to access them from any device to share them with family and friends. Dropbox iPad app allows you to add photos from your device to your Dropbox account. Once you add your photos, they will automatically sync to your other mobile devices and computers. This is done by "File Sync" feature and is the main function of Dropbox.
You can install PicBackMan's Dropbox uploader for Mac from the website and start backing up photos and videos.