They will definitely wipe your data even if they can fix it, it is standard policy and what happened when I sent mine in (my port was only loose so they just repaired it). If you really want to save your data get yourself an external charger off ebay to charge the battery so you can do a backup, I would also suggest using a microsd card to backup to, bluetooth is really slow and wifi is still a lot slower than a copy to a microsd card is.