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After activating Google Backup, you will also need to choose a backup account where the backup will be backed up, but even after that, the Google backup account can be changed at any time.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Additional settings
Step 3: Tap on  Back up and reset
Step 4: Tap on  Backup accounts
Step 5: Choose an  Account
  1. Tap on Settings
  2. Tap on Additional settings
  3. Tap on Back up and reset
  4. Tap on Backup accounts
  5. Choose an Account
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Oppo Instructions