Transfer data
I’m going on holiday and don’t want to bring my new iPhone am I able to transfer the data back to my older iPhone 6S+ and then back onto my newer iphone ?
Depends on what exactly you want to transfer. iCloud sync should be enough for most of it as Kirk mentioned. But basically you can restore iPad backup to iPhone and vice versa (data can't be merged in this case, regular backup restore with wiping target device).
