Old 5 backed up to old computer. New 6s won't talk to old iTunes, New iTunes won't talk to old system on old computer. Dragged backup from iTunes, copied to flash drive. Can I connect flash drive to newer computer, drag backup to desktop, open iTunes, drag backup to backups in new iTunes, backup 6s to that iTunes, back up 6s to iCloud, delete backup from iTunes. Since this is data not system talking to system, would this cause problems for the newer computer or the new iPhone?