I want to restore lost data or make a backup

If you have a backup of your old iPhone (iCloud or iTunes), you can restore your phone's entire data from there.

How to create a backup
How to restore an existing backup

Otherwise, you can also recover your data from Apple Health

  1. Open StepsApp
  2. Go to Settings
  3. Tap on Apple Health
  4. Enable Apple Health Sync (optional)
  5. Tap Import

You will maybe be prompted by Apple Health to allow access. Please allow full access by making sure that all switches are enabled.

Troubles with Apple Health import?

  1. Open the “Settings” app on your iPhone.
  2. Scroll down and go to "Privacy"
  3. Make sure that all switches are enabled
  4. Start StepsApp.
  5. Open StepsApp Settings (the gear button in the upper left corner) and recover your data again.