Dropbox is a cloud storage service provided by Dropbox Inc. It allows you to backup photos and videos online to access them from anywhere on any device. You can easily upload photos and videos to Dropbox account from your iPhone and iPad. You can play any type of video file on your Dropbox iOS app. Dropbox uses Apple's HTTP Live Streaming (HLS) protocol which is specially designed to stream video files on your iOS device. The quality of the stream is dependent on your wireless internet connection speed. If you have a video file which is not support by Dropbox iOS app then you may have to open it by using third party app that supports the specified video file format.
Following are the video file extensions that are supported by Dropbox iOS app: .mov, .mp4, .m4v, .mkv, .avi, .wmv, .flv & .asf.
You can install PicBackMan's Dropbox uploader for Mac from the website and start backing up photos and videos.