Yes. Your backup file is encrypted and secured with your Google account.
What this means
- Other people can't read the file without your account.
- Select the same Google account when you restore.
- The app creates backups only when you ask, or when you turn on Automatic Backup.
- It saves through the secure Android file picker and doesn't ask for access to all your files.
Tip
If you see Please select a valid Google account, choose the account that created the backup.