If you own a computer, there is always backing up to iTunes on a computer.
There are other “cloud”, offsite data storage service to store your app data to, like DropBox, BOX, Google Drive, and other offsite services to store data to.
I use iTunes, DropBox for documents and photos/images. Flickr to have duplicate backup of all my iOS device photos/images.
I use a computer and special, wireless mobile hard drives and flash memory drives to store all of my large file size videos and movies.
There are workarounds and other services/ways to put your iPad data elsewhere online.