If you have very old iPads, we have had users with iPad1 or iPad2 which no longer function well (meaning email or browsers etc. do not function, connect.) They were able to use iTunes on a computer to back it up, then transfer apps (which presumably get updated in this process) into their new iPad. They have reported this works with iReal Pro (songs/playlists being restored).
You might be able to find information at Apple support (or elsewhere) on exact details if you need to.

Otherwise Bob has given you the link if your iPad is a reasonably recent model.