If you are not able to sync data then you can try these steps:-
Restart backup sync: On your computer, click Backup and Sync Backup and Sync-Click More and then Quit Backup and Sync-Reopen Backup and Sync. Reinstall back up sync: During the installation, click Yes when you’re asked to replace your current version or you can simply uninstall and then reinstall though control panel. Disconnect and reconnect your account: On your computer, click Backup and Sync Backup and Sync.-Click Error - Google Drive folder is missing-Click Disconnect account-Sign in again.You will be asked to choose a new location for the Google Drive folder.