Is someone able to sync my android phone without me aware.that.this has happened?

Yes, it is possible for someone to sync your Android phone without your knowledge, especially if they have access to your google account or physical access to your device. Malicious apps or software can also be used to sync data without your consent. To protect yourself, ensure your device is secured with a strong passWord, enable two-factor authentication on your accounts, and regularly check for unfamiliar apps or settings.