How to put music on someone else's device without erasing their data? I have a friend who wants me to put my music from my iTunes onto her iPad.

The problem is her iPad has not been backed up onto another computer, so when I plug it in it asks to set up as new iPad or restore from settings or something like that.

How can I do it that her apps and data won't get erased, because she has very important work on there?

It is fine if her music gets deleted but nothing else. Is there a way I can put music onto her iPad without erasing data?
You can transfer files to her computer via an external hard drive, from there she can import them into her iTunes, then onto her iPad. She should really back it up though.