When Smart Backup is enabled, your Memories may back up over mobile data when Wi-Fi is unavailable.
To turn on Smart Backup:
- Tap ⚙️ in My Profile to open Settings
- Scroll down and tap 'Memories'
- Toggle on 'Smart Backup'
⚠️ Important: Always make sure your Memories are completely backed up before you log out of Snapchat, log into Snapchat on a different device, or uninstall Snapchat!