Question about purchased apps / games
So I have purchased NFS on my iPad 2 and another racing game (forgot the name right now)
Now my question is, what happens if I ever upgrade my OS either to jailbreak or any other reason? can I easily redownload them since apple has a record of my purchased apps? or how does this work?
Or is there a way to back up my apps / games?
What is the benefit of jailbreaking if I can purchase apps / games from Apple? I don't get it?
Sorry for the n00b questions