Using SyncBackPro > Technical Reference

For Gmail, you can either use application passwords, which are simpler to create but potentially less secure, or you can create a ClientID and Client Secret. It is possible that at a future date, Google will disallow application passwords.

Once you have a Client ID and Client Secret you can use it in the Linked Cloud Accounts so that you no longer need to enter it again.

We have an article online that explains in detail how to create a ClientID and Client Secret.