Everything else backed up. It's just the activity tab from the Apple Watch didn't transfer. As far as I knew I was backing everything up. All the steps transferred over as well.
Yea, the backup of the phone needs to happen AFTER you unpair the watch. The act of unpairing triggers a backup of the watch to your phone. Afterwards, the backup of your phone to iTunes or iCloud would include that watch backup (as long as encryption is enabled).
FYI. For the health data to be backed up you either use iTunes(set a passcode for encryption) or iCloud (which encrypts)Just to confirm, I need to backup the old phone to iTunes (or is iCloud sufficient?) does the SIM card need to be present in the old phone? Does it matter if I already put the sim into the new phone?